50 results about "Photoionization" patented technology

The invention discloses a multi-parameter sensor system for monitoring the environment of a Maotai-flavor liquor production workshop, and the system comprises a plurality of intelligent sensor cabinets which are disposed in a distributed manner, are disposed in different process links of the liquor production workshop, and are used for collecting and preprocessing environment data; and the data service management platform is in communication connection with the plurality of intelligent sensor cabinets and is used for receiving, storing, fusing and analyzing the data from the intelligent sensor cabinets and performing visual display. Through high integration of various principles (such as electrochemical, infrared and PID photoionization) sensors, the PID photoionization sensor and various electrochemical and physical sensors are creatively integrated into single equipment, high-precision and total-factor monitoring of more than 20 brewing key environment parameters such as temperature and humidity, TVOC, ethanol, hydrogen sulfide and PM2.5 is realized, the monitoring dimension is comprehensive, the precision is high, and the monitoring cost is low. The perception capability on the change of the workshop microenvironment is obviously improved, and a solid data support is provided for the optimization of a precise brewing process.

The present application relates to a kind of photoionization ion mobility spectrometry of fast switching combination reagent ion, including photoionization ion mobility spectrometry, reagent ion generation device, reagent molecule carrier gas is introduced to reagent molecule into the reaction zone of ion mobility spectrometry, different types of reagent ions can be obtained by switching different gas paths and reagent molecules in positive ion mode, and the reagent ions in conventional gas flow mode are mainly (C3H6O)2H + , after switching combination gas path device, new hydrate cluster reagent ion H3O (H2O) n + Is generated by the regulation of acetone and water reagent molecule, and the reactivity is higher, the sensitivity of target detection is higher, so that by switching different gas paths, the high sensitivity and high selectivity detection of target compound can be realized, such as the detection of exhaled air ammonia and atmospheric ammonia in complex matrix background, and any sample pretreatment process is not needed.

The utility model provides a water sample odor monitoring device. The water sample odor monitoring device comprises a heating module, an observation container, a gas freezing dryer and an enrichment detection chamber, the heating module is provided with a water inlet and a water outlet, the water outlet is connected with an observation container, the upper part of the observation container is provided with a gas outlet, the gas outlet is communicated with a gas inlet of a gas freezing dryer, a gas outlet of the gas freezing dryer is communicated with the enrichment detection chamber, the enrichment detection chamber is provided with a photoion PID sensor, and the photoion PID sensor is connected with the observation container. And the photoion PID sensor is in communication connection with the control module. By adopting the technical scheme of the utility model, the online real-time monitoring of the odor of the water sample is realized, the timeliness of water quality monitoring is improved, and the odor of the factory water is ensured to meet the requirements of the new national standard of water quality and the Shenzhen landmark.

This invention discloses a miniaturized portable mass spectrometer based on a vacuum ultraviolet photoionization source and its analytical method, relating to the field of mass spectrometry analysis technology. The mass spectrometer includes: a sample introduction and pre-screening module, consisting of a sample introduction system and an intelligent sample pre-screening unit. The sample introduction system enables gas-liquid sample switching. The pre-screening unit collects data through physical and chemical characteristic detection subunits, and outputs target compound type and parameter adjustment instructions after processing by a data analysis subunit. This invention, through the intelligent sample pre-screening unit in the sample introduction and pre-screening module, utilizes physical and chemical characteristic detection subunits to quickly acquire physicochemical characteristic data such as the color spectrum, volatile components, and pH value of the sample. The compound type recognition model built into the data analysis subunit can automatically compare with the sample characteristic database, quickly identify the target compound type, and generate ionization source parameter adjustment instructions, greatly simplifying the operation process and reducing detection time.

The application discloses a photoionization and discharge ionization combined ion source. After sample molecules are photoionized, the sample molecules are focused through an ion transmission hexapole, and the peak-to-peak value of a radio frequency voltage applied to the ion transmission hexapole is increased, so that discharge ionization is introduced between the ion transmission hexapole and an open electrode. Sample molecules which are not photoionized can be continuously subjected to discharge ionization, so that the signal strength and sensitivity are improved. Meanwhile, the discharge ionization has high energy, can ionize substances which cannot be ionized by photoionization, and widens the application range of the ion source.

The application discloses a kind of gas-phase pollutant full-species high-sensitivity online mass spectrometer and detection method, it is related to mass spectrometry technical development technical field.Mass spectrometer includes high-energy photoionization ion source structure, ion transmission structure and mass spectrum detection structure.High-energy photoionization ion source structure includes high-energy photon generation structure, sample introduction tube and ionization chamber, high-energy photon generation structure utilizes neon discharge to generate high-energy photon, high-energy photon is mixed with the gas to be measured that enters through sample introduction tube in ionization chamber, and the gas to be measured is ionized;Ion transmission structure is equipped with radio frequency quadrupole rod, for filtering the large amount of N2 + And O2 + Non-target background ions generated when measuring air;Mass spectrum detection structure is equipped with pulse-compensation double-electrode ion removal device, for further removing non-target background ions, relieving the measurement saturation and loss of ion detector.The application can realize the full coverage high-sensitivity detection of all gas-phase organic and inorganic pollutants in atmosphere.

This invention discloses an electrospray extraction / photoionization composite ion source for atmospheric pressure interface mass spectrometry, belonging to the field of mass spectrometry detection. It includes a sample transport and ionization mechanism, an extraction electrospray mechanism, and a vacuum ultraviolet light source mechanism. The extraction electrospray mechanism is fixedly connected to the sample transport and ionization mechanism, and the sample transport and ionization mechanism is fixedly connected to the vacuum ultraviolet light source mechanism. This invention utilizes the aforementioned electrospray extraction / photoionization composite ion source for atmospheric pressure interface mass spectrometry, enabling efficient ionization of gaseous and particulate organic components of different polarities, volatility, and molecular weights in the air. Through a reasonable structural design, it can operate under atmospheric pressure conditions, achieving the purpose of coupling with atmospheric pressure interface mass spectrometry.

The invention relates to the technical field of electronic information, and discloses a CT three-dimensional reconstruction coordinate-assisted mass spectrum imaging method and system, and the method comprises the steps: obtaining scanning data of a to-be-detected sample, and reconstructing a three-dimensional digital model; based on the three-dimensional digital model, planning sampling points on the surface of the sample, a laser desorption path and a sample attitude angle at each sampling point; controlling the sample to move according to the laser desorption path, so that when each sampling point on the sample reaches a laser beam focus of the normal-pressure laser desorption / secondary photoionization device, desorbing the surface of the sample at the sampling point at the planned sample attitude angle, and collecting mass spectrum data through a mass spectrometer; and associating the acquired mass spectrum data with the three-dimensional space coordinates of the corresponding sampling points, and reconstructing a three-dimensional distribution image of molecules on the surface of the sample to be detected. According to the invention, high-spatial-resolution and high-sensitivity mass spectrum imaging on the surfaces of crisp samples which cannot be sliced and irregular samples can be realized.

The application provides a method for monitoring dioxins in flue gas by photoionization time-of-flight mass spectrometry online, screening volatile organic pollutants with high concentration or high instrument response in flue gas as dioxin indicators, directly monitoring the indicators in flue gas by photoionization time-of-flight mass spectrometry online, establishing the correlation between high-abundance indicators and dioxins by the simultaneous monitoring of indicators online and the offline detection of dioxins, and realizing the indirect online monitoring of dioxins in flue gas. The online monitoring cycle of the application is 20 min, and the offline sampling cycle is 120 min, so that 6 points of online monitoring can be carried out in 1 offline sampling cycle, and the correlation model is established by using 6 online monitoring points corresponding to 1 offline sampling point in the model establishment process. The online monitoring model of dioxins established by the application is a single or multiple correlation model, which guarantees the applicability of the correlation model, and the fault tolerance and risk resistance of the application to complex incineration environment.

The invention discloses a desorption electrospray and secondary photoionization mass spectrometry imaging device combined with an ion funnel, which comprises a double-light-source secondary ionization component, a two-stage ion funnel, a desorption electrospray ionization source and a three-degree-of-freedom displacement imaging platform for carrying a glass slide of a measured object, the desorption electrospray ionization source is arranged above the three-degree-of-freedom displacement imaging platform and located on one side of the glass slide, an electrospray sampling pipe for sampling molecule-ion droplet clusters is arranged at an inlet of the double-light-source secondary ionization assembly, and the electrospray sampling pipe is arranged above the three-degree-of-freedom displacement imaging platform and located on the other side of the glass slide; an outlet of the double-light-source secondary ionization assembly is connected with an inlet of the two-stage ion funnel, and an outlet of the two-stage ion funnel is externally connected with mass spectrometry equipment. Through the integrated design of double-light-source same-cavity secondary ionization, gas phase doping and the two-stage ion funnel, the ionization efficiency and the ion transmission efficiency of the to-be-analyzed object can be remarkably improved.

The invention discloses a data correction processing method of a vacuum ultraviolet light ionization source time-of-flight mass spectrometer, which comprises the following steps: acquiring continuously monitored data points including horizontal axis time t and intensity values a1, b1, c1... of each substance along with the time t, calculating attenuation coefficients lambda1, lambda2, lambda3... of each substance along with the time, finding a substance with the attenuation coefficient closest to that of the target monitoring substance as a correction substance, obtaining each intensity value of the correction substance, dividing the intensity value by the first intensity value to generate a column of new data, and dividing each intensity value of the target substance by a column of data points newly generated by the corresponding correction substance to obtain corrected data points of the target substance. According to the method, the problem of signal attenuation caused by long-time working of the vacuum ultraviolet lamp can be effectively corrected.

The invention relates to the technical field of mass spectrometry instruments, in particular to an oxygen atom induced dissociation device and method based on a photoionization source. The device comprises a sample introduction capillary tube, an ionization source cavity, a repulsion electrode, a vacuum ultraviolet deuterium lamp, a transmission electrode group and a differential electrode, the repulsion electrode, the transmission electrode group and the differential electrode are sequentially arranged in the ionization source cavity in parallel at intervals, and the vacuum ultraviolet deuterium lamp penetrates through the ionization source cavity and then extends into an area between the repulsion electrode and the transmission electrode group; the sample introduction capillary tube sequentially penetrates through the left side wall of the ionization source cavity and a center hole of the repulsion electrode, and the outlet end of the sample introduction capillary tube is located in an area between the repulsion electrode and the transmission electrode group; and direct-current voltage is applied to the repulsion electrode, the transmission electrode group and the differential electrode. By utilizing the characteristics of vacuum ultraviolet light, the photoionization source can generate oxygen atom-induced dissociation reaction in situ, so that the technical threshold and cost are reduced, and convenient switching between two modes of soft ionization and rich structure information is realized.

This invention discloses a photoionization ion migration tube with tunable reactant ions. The ion migration tube contains a first ionization region, a second ionization region, and a third ionization region placed adjacent to each other from left to right. The first ionization region is for initial electron generation and ultraviolet light transmission path control; the second ionization region is for reactant ion generation; and the third ionization region is for the ionization of the sample to be tested. By rapidly switching the concentration of the dopant reagent in the first ionization region, different reactant ions can be rapidly switched and generated with high purity in the second ionization region. Utilizing the differences in the reaction selectivity of different reactant ions, highly selective detection of the sample to be tested can be achieved. Alternatively, by utilizing the differences in the product ions formed by different reactant ions and the sample to be tested, more one-dimensional information can be provided for the qualitative and quantitative analysis of the sample to be tested.

The present invention discloses an underexpanded jet vacuum ultraviolet photoionization source, comprising an inlet pipe, a coaxial injector, a vacuum ultraviolet light source, an underexpanded jet ionizer, an insulating exhaust ring, a focusing differential electrode, an insulating ring, a cavity, and a vacuum pump assembly. Sample gas enters the coaxial injector through the inlet pipe and is smoothly and coaxially introduced into the underexpanded jet ionizer. In the high-pressure ionization zone of the underexpanded jet ionizer, the sample gas is ionized into ions by vacuum ultraviolet light. After passing through a sonic velocity limiting orifice, the ions enter a low-pressure scattering zone. Under the action of the underexpanded jet in the scattering zone and the focusing electric field between the ionizer and the focusing differential electrode, the ions are rapidly and focusedly transmitted into a post-stage vacuum. Excess gas is pumped out by the vacuum pump assembly through the insulating exhaust ring. This ionization source overcomes the problems of shock wave interference generated by traditional jet technology and collision-induced dissociation generated by radio frequency transmission technology, effectively improving ion transmission under high pressure.

The invention relates to the technical field of mass spectrometry instruments, in particular to a photoionization source integrated with a filamentous ion guider. Comprising an ionization source cavity, a vacuum ultraviolet lamp, a repulsion electrode and a filamentous ion guider, wherein the vacuum ultraviolet lamp, the repulsion electrode and the filamentous ion guider are arranged in the ionization source cavity from top to bottom; an ion output port is formed in the bottom of the ionization source cavity; photons emitted by the vacuum ultraviolet lamp sequentially pass through the repulsion electrode and the filamentous ion guider and then are output from the ion output port. The filamentous ion guider comprises a support frame and a plurality of filamentous electrodes which are arranged on the support frame at intervals along the circumferential direction; the plurality of filamentous electrodes are enclosed to form a conical ion focusing transmission channel of which the inner diameter is gradually reduced along the photon emitting direction; dC voltage is applied to the repulsion electrode, and radio frequency voltage is applied to the wire electrode. According to the invention, the surface area of collision between photons and the electrode is greatly reduced, so that the photoelectron yield is reduced, complex side reactions are avoided, and the purity of single-photon ionization is ensured.

The invention provides granule purification equipment and method for removing static electricity of granules, and relates to the technical field of granule treatment, the equipment comprises a granule purification equipment body, a light wave equipment module and an illumination treatment cavity; the light wave equipment module and the light treatment cavity are both arranged in the granule purification equipment body; a granular material flowing channel of the granular material purification equipment body passes through the illumination treatment cavity; the light wave equipment module is used for irradiating the granular materials which move along the granular material flowing channel and enter the illumination treatment cavity so as to realize static electricity removal treatment on the granular materials; wherein light waves emitted by the light wave equipment module can ionize air around the granules. On the basis, the static electricity carried by the granules is neutralized by ions generated by photoinduced air ionization, so that harmful substances such as ozone are not generated, and the device is safe and environment-friendly; and due to the non-contact optical radiation treatment mode, the static electricity of the particles can be efficiently removed.

The present application relates to mass spectrometry instrument, specifically to a kind of partition non-uniform field photoionization and / or photochemical ionization source device that can realize reagent sufficient ionization, including ultraviolet light source, ion repulsion electrode, isolation electrode, ion transmission electrode, ion focusing electrode, ion source outlet electrode, sample introduction capillary, side extraction valve and ion source cavity;Ion repulsion electrode, isolation electrode, ion transmission electrode, ion focusing electrode and ion source outlet electrode are placed in parallel, insulated, coaxial in ion source cavity, wherein isolation electrode and ion focusing electrode divide ionization zone into three chambers, respectively reagent ion generation zone, ion molecular reaction zone and ion focusing zone. By changing the electric field intensity of reagent ion generation zone, the rapid switching of photoionization or photochemical ionization can be realized. The isolation electrode is a convex electrode with a central through hole and an edge thickness of 1-10 mm. By increasing the thickness of the isolation electrode and appropriately reducing the size of the central through hole, the influence of sample gas backflow on the ionization process of reagent molecules can be effectively avoided. Secondly, one or more ion transmission electrodes are added in the reagent ion generation zone, which can make the reagent molecules fully photoionize, produce high-intensity and high-purity reagent ions, and thus effectively improve the sensitivity of the analyte analysis. The device can be used with any type of mass analyzer to achieve high-sensitivity and rapid detection of various trace volatile components.

The application relates to the field of electronic information technology and discloses a CT three-dimensional reconstruction coordinate-assisted mass spectrum imaging method and system. The method comprises the following steps: acquiring scanning data of a sample to be measured and reconstructing a three-dimensional digital model; based on the three-dimensional digital model, planning sampling points on the surface of the sample, a laser desorption path and a sample posture angle at each sampling point; controlling the sample to move along the laser desorption path, so that when each sampling point on the sample reaches the focal point of a laser beam of an atmospheric pressure laser desorption / secondary photoionization device, the sample surface at the sampling point is desorbed at the planned sample posture angle, and mass spectrum data is collected through a mass spectrometer; and the collected mass spectrum data is associated with the three-dimensional space coordinates of the corresponding sampling points, and a three-dimensional distribution image of molecules on the surface of the sample to be measured is reconstructed. The application can realize high-spatial-resolution and high-sensitivity mass spectrum imaging on a sample which is too fragile to be sliced and an irregular sample surface.

The invention discloses a mobile sampling time-of-flight mass spectrometry detection device and application, and belongs to the technical field of mass spectrometry. The device comprises a reaction tube, a sleeve, a moving mechanism, a grading air exhaust mechanism, a photoionization chamber and a reflective time-of-flight mass spectrometer, wherein the wall surface of the reaction tube is provided with multiple axial sampling areas; the sleeve is sleeved outside the reaction tube; the side wall of the sleeve is provided with a quartz nozzle; during working, the moving mechanism drives the sleeve to enable the quartz nozzle to be aligned with a sampling area, gas forms an ultrasonic molecular beam through the funnel, neutral molecules are ionized by the light source after graded gas extraction and pressure reduction, and ions are analyzed by the mass spectrometer. The device is used for research on product selectivity and reaction mechanism by spatial distribution of short-chain olefin prepared by Fischer-Tropsch synthesis, isomeride can be distinguished, axial species distribution can be accurately represented, and detection selectivity and reliability can be improved.

The invention provides a distiller's yeast quality grade identification method based on a thermal desorption-photoionization ion migration electronic nose system. The method comprises the following steps: firstly, enriching and concentrating distiller's yeast volatile matters and efficiently removing moisture through a thermal desorption module; then carrying out millisecond-level separation detection on trace characteristic components by adopting a photoionization ion migration electronic nose, wherein a distiller's yeast characteristic fingerprint spectrum can be accurately captured by virtue of a ppb-level detection limit of the photoionization ion migration electronic nose; and finally, an SVM algorithm is integrated, an accurate distiller's yeast quality grade discrimination model is constructed, and intelligent classification of distiller's yeast quality grades is realized. Actual sample verification shows that the method can complete distiller's yeast grade identification within 3 minutes, has high goodness of fit with evaluation results of sensory experts in the industry, and provides a new quality control normal form integrating rapid detection, intelligent analysis and process monitoring for white spirit production.

The application provides a silicon-based transistor channel temperature measuring device and method, and relates to the technical field of temperature measurement. The measuring device comprises: a superconducting coil, which is used for providing a magnetic field for a transistor to form two spin state energy levels; a low-temperature thermostat, which is used for providing a low-temperature environment for the transistor, and in the low-temperature environment, a first ratio of particle population numbers on the two spin state energy levels satisfies a Boltzmann distribution related to a temperature value of the channel; a tunable laser module, which is used for generating a first laser in a near-infrared wave band; a current processing module, which is used for collecting a tunneling current; a processor, which is used for determining a photoionization signal strength; based on the photoionization signal strength, a second ratio of probabilities of photoionization events occurring on the two spin state energy levels is determined; based on the second ratio, the first ratio is determined; and according to the Boltzmann distribution and the first ratio, the temperature value of the channel is obtained.

This invention discloses a method and related apparatus for determining the Townsend second coefficient in an electrode photoionization corona criterion, belonging to the field of electrode technology. The method determines the ionization region boundary of a conductor during corona initiation using corona initiation voltage, environmental parameters, and the nominal electric field analytical formula. Based on the obtained ionization region boundary, Morrow's ionization coefficient and adhesion coefficient formulas are used to substitute the nominal electric field analytical formula into the photoionization corona criterion, yielding an integral expression for the criterion. The integral interval of the integral expression is discretized, and an initial value is assigned to the Townsend second coefficient. This value is then substituted into the photoionization corona criterion for discretized integral calculation, ultimately obtaining the Townsend second coefficient. This invention can be applied to all AC / DC conductors requiring the use of the photoionization corona criterion, and can determine the Townsend second coefficient of conductor corona initiation under varying conductor geometry, ground elevation, humidity, air pressure, and temperature conditions.

The present application relates to a method for regulating the ion-molecule reaction process in a photoionization source. The method comprises a sample gas, a sample inlet pipeline, a valve, a vacuum ultraviolet light source, an ionization source cavity, an inlet electrode, a light introduction electrode, an outlet electrode and a mass analyzer. The light emitted by the vacuum ultraviolet light source is perpendicular to the axis direction of the light introduction electrode. The range of the vacuum ultraviolet light emitted by the vacuum ultraviolet light source inside the light introduction electrode is the ionization zone. The region between the ionization zone and the outlet electrode constitutes the reaction zone. The sample gas flow q is regulated by the valve to change the ion movement speed v g in the gas flow field; or the voltage difference U applied to the light introduction electrode and the outlet electrode (i.e. the reaction zone) is regulated to change the ion movement speed v d in the electric field; the ion-molecule reaction time in the reaction zone is changed by changing v g and v d , so as to obtain the ion-molecule reaction process or regulate the ion-molecule reaction process.

The utility model provides an electrodeless ultraviolet lamp with adjustable luminous intensity and a photoionization sensor. According to the electrodeless ultraviolet lamp, an ultraviolet lamp tube comprises a glass shell with an opening in one end and an ultraviolet window which is arranged at the opening of the glass shell in a sealed mode so that the inner space of the glass shell can form a closed cavity; the closed cavity is filled with working gas; the driving electrodes are fixedly arranged on the glass shell in a sleeving manner and are arranged at intervals in the axial direction of the glass shell, and the driving electrodes are electrically connected to the driving module; the driving module is used for applying alternating current voltage to each driving electrode pair formed by a plurality of driving electrodes; for the driving electrode pair, one driving electrode is a grounding electrode, the other driving electrode is a high-voltage electrode, and the driving module is used for enabling the grounding electrode to be grounded and applying potential to the high-voltage electrode. The photoionization sensor comprises the electrodeless ultraviolet lamp. According to the ultraviolet lamp for the PID sensor, the problem of large limitation of a luminous intensity adjusting mode of an existing ultraviolet lamp for the PID sensor can be solved.

An online detector for halothane anesthetics in blood uses ion mobility spectrometry as the basic detection technology and combines it with headspace sampling technology to achieve direct analysis of halothane anesthetic concentrations in whole blood without sample pretreatment. The detector consists of a fully automatic headspace sampler, a three-way connector, a variable-diameter sampling sleeve, and a negative ion mode photoionization ion mobility spectrometer. The fully automatic headspace sampler includes a sample carrier, a heating furnace, an injection needle and control components, a six-way valve quantitative loop, and a sample gas transmission tube; the three-way connector is connected to the sample gas transmission tube, the variable-diameter sampling sleeve, and the air purification tube and air respectively. The detection limit of sevoflurane tested by this device and method can reach a concentration below 1 ng / μl, and the detection and analysis time for a single sample is less than 2 minutes. The method of the present invention is intelligent, fast, efficient, and reliable.

The invention relates to the technical field of non-traditional machining, and discloses an ultra-high-speed jet flow high-precision punching method which is implemented by means of a device integrating gas thermodynamic regulation and control and photoelectric mixed field constraint functions, an inert gas rotating vortex field is constructed through a tangential inclined gas nozzle, and thermodynamic regulation and control of preheating or precooling are conducted on gas. The metal wire is triggered to electrically explode to drive the liquid medium to form an ultra-high-speed jet flow, meanwhile, strong ultraviolet and X-ray radiation pulses generated by electrical explosion are utilized, vortex gas is excited into rotating plasma in situ through a photoionization mechanism to induce an annular magnetic field, and the jet flow forms an ultra-high-speed jet flow under the cooperative constraint of the pneumatic pressure gradient and the electromagnetic Lorentz force. And high-collimation target-distance-crossing impact workpieces are kept. Rayleigh-Taylor instability and radial divergence of jet flow are restrained, eddy current active chip removal is combined, and large-target-distance and high-precision punching of hard and brittle materials difficult to machine is achieved.

The application discloses a mobile sampling time-of-flight mass spectrometry detection device and application, and belongs to the technical field of mass spectrometry analysis. The device comprises the following: a reaction tube with an axial multi-sampling area, a sleeve pipe sleeved outside the reaction tube and provided with a quartz nozzle on the side wall, a moving mechanism for driving the sleeve pipe to move axially, a staged pumping mechanism comprising a funnel and a multi-stage turbo pump, a photoionization chamber provided with a synchrotron radiation vacuum ultraviolet light source, and a reflection type time-of-flight mass spectrometer. When working, the moving mechanism drives the sleeve pipe so that the quartz nozzle is aligned with the sampling area, gas forms an ultrasonic molecular beam through the funnel, neutral molecules are ionized by the light source after pressure reduction through the staged pumping, and the mass spectrometer analyzes ions. The device is used for researching spatial distribution of short-chain olefins prepared through Fischer-Tropsch synthesis, product selectivity and reaction mechanism, can distinguish isomers, accurately characterizes axial species distribution, and improves detection selectivity and reliability.

The embodiment of the invention discloses a pulse laser induced single event effect simulation method and a related device, and the method comprises the steps: carrying out the modeling of pulse laser according to a photoionization analytical calculation method, obtaining a pulse laser induced charge generation rate function, and obtaining a heavy ion induced charge generation rate function in a computer aided design technology; comparing the pulse laser induced charge generation rate function with the heavy ion induced charge generation rate function item by item to obtain a three-dimensional generator of a single-photon absorption induced electron-hole pair; and according to the three-dimensional generator of the single photon absorption induced electron hole pair, evaluating the influence of the pulse laser induced single event effect on the electrical characteristics of the device. It can be seen that according to the embodiment of the invention, the parameters in the heavy ion charge generation rate function are modified in combination with the pulse laser charge generation rate function instead of directly modifying the parameters of the heavy ion model for device-level pulse laser incidence simulation, and therefore the simulation precision of the pulse laser single-particle damage model can be improved.

The application relates to the technical field of mass spectrometry instruments, in particular to a device for improving the detection sensitivity of a photoionization source in a low-pressure environment, which comprises a sample inlet tube, an ionization source cavity, a vacuum ultraviolet lamp, a push-pull electrode, a gas supplement capillary, an inert gas source and an ion funnel; one end of the gas supplement capillary is connected with the inert gas source; the other end of the gas supplement capillary penetrates into the ionization source cavity and extends to the position between the push-pull electrode and the ion funnel. The device can improve the detection sensitivity of the photoionization source in the low-pressure environment without increasing the sample amount; in addition to the function of sampling from the low-pressure environment, the ionization source cavity also uses the gas supplement capillary to introduce high-purity inert gas, so that the gas pressure in the ionization source cavity can be maintained in the gas pressure range in which the ion funnel can work efficiently, efficient transmission of sample ions in the source is realized, and the detection sensitivity of the instrument is greatly improved.

The application discloses a sampling tube array VUV photoionization source for mass spectrometry, comprising a large-flow sampling port, an array VUV light source sampling tube, a VUV light source, an ion transmission cavity, an ion transmission electrode, an ion extraction electrode and a gas suction pump. Since the sensitivity of the VUV photoionization source is closely related to the sample amount and sample utilization, in order to improve the sensitivity of the VUV photoionization source, the sample amount and sample utilization can be increased. The application designs a sampling tube array VUV photoionization source, which combines the VUV light source and the sampling tube in a clever way, so that the sample can be effectively irradiated by the VUV light source during the transmission of the sampling tube, thereby improving the sample utilization and the sample ionization efficiency, and achieving the purpose of VOCs detection sensitivity. In addition, a large-flow sampling port is adopted, so as to improve the accuracy of the sampling concentration. The application can effectively improve the detection sensitivity and accuracy of the mass spectrometer for gas samples, and has a wide application prospect in the technical field of VOCs detection such as rapid atmospheric environment monitoring and industrial process online monitoring.