31 results about "Thermal ionization" patented technology

The invention relates to the technical field of nuclear reactor design, in particular to an air-cooled nuclear reactor system for series thermal ionization magnetohydrodynamic power generation. Comprising a reactor core which comprises a fuel grid which is formed by a plurality of grid unit plates which are crossed transversely and longitudinally; each grid unit plate is made of sheet-shaped fuel; the thermal ionization magnetohydrodynamic power generation element is arranged outside the reactor core and is used for providing a magnetic field for the fuel grid; the cooling system is used for providing rare gas for the reactor core and is configured to enable the rare gas to exchange heat with the fuel grid and to be converted into conductive fluid in a generated magnetic field, and the conductive fluid flows in the generated magnetic field to generate induced electromotive force so as to realize thermoelectric conversion. While high thermoelectric conversion efficiency is ensured, the engineering feasibility of an air-cooled nuclear reactor system is improved, and the problems that gaseous nuclear fuel is prone to corrode structural materials, prone to leakage and large in aftertreatment difficulty are solved.

The invention belongs to the field of geological dating, and particularly relates to an improved method for determining the U-Pb age of micron-sized sphene. According to the invention, the matrix effect related to the dating Fe2O3 content of sphene is confirmed; a large number of tests show that the 206Pb / 238U ratio obtained by the TIMS (TIMS (Thermal Ionization Mass Spectrometer)) and SIMS (Secondary Ion Mass Spectrometer) of the sphene standard sample is strongly correlated with the Fe2O3 mass fraction, so that a simplified method for directly correcting the 206Pb / 238U ratio of an unknown sample is established, and the 207Pb / 235U age is corrected by adopting a similar principle. The deviation between the age of the sphene after correction and the reference age is reduced from 12.3% to 0.4%, which indicates that the corrected age result is more accurate; by adopting the method, the natural sphene with the Fe2O3 content of 0.019-38.31% can be accurately obtained, and the method has the advantages of high accuracy and simple correction process.

The utility model discloses a Faraday cup of an ion receiver of a thermal ionization mass spectrometer, which comprises a non-metal receiving support, a non-metal receiving electrode and a pair of external fixing metal plates, the non-metal receiving support is concaved inwards to form a notch communicated with the outside, the non-metal receiving electrode is arranged in the notch, and the external fixing metal plates are fixed on the non-metal receiving support. The pair of external fixing metal plates are oppositely fixed on the two side surfaces of the non-metal receiving bracket, and the external fixing metal plates and the non-metal receiving bracket are encircled to enable the notch to only have a state that the top is communicated with the outside, so that the whole Faraday cup retains the rigidity of metal, the outside is not easy to deform, and the service life of the Faraday cup is prolonged. The non-metallic material is adopted in the device, so that the device has the characteristic of not rebounding ions, interference on ion measurement can be effectively reduced, and the measurement accuracy is improved.

The invention relates to the technical field of semiconductor manufacturing processes, and discloses a method and a device for removing ammonium chloride crystals in silicon nitride production equipment, and the method comprises the following steps: i) oxygen free radicals are generated by oxygen free radical source gas through thermal ionization to obtain gas containing the oxygen free radicals; and ii) introducing the gas containing the oxygen free radicals into the pipeline containing the ammonium chloride crystal substance, and reacting with ammonium chloride in the pipeline containing the ammonium chloride crystal substance to generate a gaseous product. The oxygen free radicals react with ammonium chloride on the inner wall of the pipeline containing the ammonium chloride crystals, ammonium chloride crystals are converted into gaseous products easy to collect, the ammonium chloride crystals on the inner wall of the pipeline containing the ammonium chloride crystals can be rapidly removed, the pipeline does not need to be disassembled and assembled, the equipment utilization rate and the operation efficiency are improved, and the operation cost is reduced.

This invention provides an application of ion emitters based on covalent organic framework materials in thermal ionization mass spectrometry (TIEMS), specifically for improving the ionization efficiency of uranium during TIEMS measurements. Compared to conventional dual-band source modes in TIEMS, and ionization enhancement techniques such as graphite methods, benzene vapor carburizing methods, and graphene oxide methods, this invention significantly improves uranium ionization efficiency, facilitating the accurate measurement of ultra-trace and low-abundance uranium isotopes.

The invention discloses an intelligent regulation and control system for heat separation synergistic targeted transdermal drug delivery, and relates to the technical field of crossing of modernization of traditional Chinese medicine and intelligent medical equipment. The driving module is integrated in the application unit, the pressure unit generates periodic pressure changes, the temperature control unit is used for heating liquid medicine, and the electric field unit is used for establishing an electric field in a medicine cavity. The intelligent control box is used for receiving signals of the sensor and controlling the pressure unit, the temperature control unit and the electric field unit to cooperatively work in stages, and through the progressive force-heat-ionization triple synergistic effect, the defects that in the prior art, the infiltration promotion means is single, and the synergism is insufficient are effectively overcome; the medicine permeation efficiency and depth are obviously improved; by means of the multi-electrode system capable of being independently regulated and controlled, dynamic directional gathering and long-acting maintaining of the medicine in a subcutaneous focus area are achieved, and the problems that a traditional method is poor in targeting performance and fast in medicine dispersion are solved.

The application discloses a high-salt food heavy metal detection equipment and a detection method, and applies a dissolution voltammetry method for measurement, and comprises an outer casing, an electrode cover and a stirring device, wherein a thermal ionization chamber is preinstalled with an electrolyte, the bottom of the outer casing is provided with the thermal ionization chamber, one end of the thermal ionization chamber is communicated with an air inlet channel, the air inlet channel is installed with a hot air blower, the hot air blower blows hot air into the thermal ionization chamber to accelerate sample decomposition ionization. The middle part of the outer casing is provided with a partition, the partition is provided with the stirring device above and the thermal ionization chamber below, and the inner wall of the thermal ionization chamber is provided with a heat preservation layer to reduce heat loss. In use, the other end of the thermal ionization chamber is provided with an air outlet channel and a butterfly valve, when the sample enters the thermal ionization chamber, the hot air blower blows hot air to accelerate sample decomposition ionization, and after the sample is completely decomposed, the butterfly valve is closed to make the sample solution enter a rotating container.

The utility model discloses an anti-splashing thermal ionization mass spectrometer liquid nitrogen liquid inlet hopper, which relates to the technical field of thermal ionization mass spectrometry and comprises a liquid inlet shell, a plurality of limiting blocks are fixedly connected to the inner wall of the liquid inlet hopper shell close to the top end, a curved-surface funnel is movably connected to the inner wall of a cushion block, a liquid inlet is formed in the bottom of the curved-surface funnel, and a liquid outlet is formed in the bottom of the curved-surface funnel. A first flow guide plate is movably connected to the inner wall of the liquid inlet, a flow guide disc is fixedly connected to the bottom of the curved-surface funnel, a plurality of second flow guide plates are fixedly connected to the inner wall of the liquid inlet hopper shell, a filtering opening is formed in the bottom of the liquid inlet hopper shell, and a filtering hopper is movably connected to the top end of the filtering opening. The lower surface of the curved-surface funnel stops part of splashing liquid, the liquid flows along the gap between the outer wall of the flow guide plate and the flow guide plate, and when the internal liquid reacts, smoke is guided along the arc-shaped curved surface and the gap of the flow guide plate, so that the smoke flows towards the direction of the opposite liquid pouring surface, and the influence of the smoke on the liquid inlet efficiency is reduced.

The invention discloses a filament power supply of a surface thermal ionization mass spectrometer ion source, which comprises a power supply, an isolation transformation unit, an MCU control unit, a series voltage stabilizing circuit, a proportional integral constant current control circuit, an output driving circuit, a current and voltage monitoring circuit and an indication control panel, the proportional-integral constant-current control circuit adopting negative feedback is established and has the advantages of being high in control precision and current stability and the like, in addition, the current and voltage monitoring circuit collects and outputs current signals and voltage signals to the MCU control unit, the MCU control unit controls the proportional-integral constant-current control circuit according to the current signals and the voltage signals, and therefore the control precision of the proportional-integral constant-current control circuit is improved. Therefore, the output current of the output driving circuit is controlled and corrected, and the filament current is ensured to be stabilized at a set target value. And the current control precision and the current output stability are improved.

The invention relates to the technical field of single crystal impurity detection, and particularly discloses a method for detecting superhigh-purity germanium single crystal shallow-energy-level impurities. The method comprises the following steps: pretreating a germanium single crystal sample, sequentially carrying out photoetching, electron beam evaporation, annealing treatment and ohmic contact treatment to obtain a to-be-detected sample, putting the to-be-detected sample into a photothermal ionization spectrometer to obtain a photothermal ionization spectrum of the to-be-detected sample, comparing spectral line positions and intensities of elements, and calculating the concentration of the to-be-detected sample according to the spectral line positions and intensities of the elements. The impurity types and the concentration of the ultra-high-purity germanium single crystal shallow-energy-level impurities are obtained. According to the method, the metal indium film grows on the upper surface of the germanium single crystal, and shallow-energy-level impurities of the germanium single crystal can be detected in the photo-thermal ionization spectrometer without adding a conductive substance to the lower surface of the germanium single crystal. Meanwhile, the germanium single crystal is subjected to acid pickling treatment by utilizing an acid pickling solution with high nitric acid content, so that the germanium single crystal subjected to acid pickling can be tightly combined with the indium film evaporated by the electron beam, and the prepared sample with the indium film loaded on the upper surface has good ohmic contact characteristics.

The present invention provides an ionization emitter for lead isotope analysis of trace samples, its preparation and application. Among them: the ionization emitter is a β-phase silicon nitride emitter, specifically composed of a β-phase silicon nitride suspension and phosphoric acid solution as an auxiliary material for the emitter. The application involves a method for testing lead isotopes in trace samples, using a β-phase silicon nitride suspension as the ionization emitter to enhance the thermal ionization efficiency of lead samples, while using phosphoric acid solution to assist ionization, and using a high-purity tantalum filament as the sample carrier to test lead isotopes. The method of the present invention has the advantages of low cost and simple operation. Compared with the traditional method based on rhenium strip and silica gel spotting, the β-phase silicon nitride emitter of the present invention can obtain good sensitivity on the tantalum strip, and good lead isotope test accuracy can be obtained for sample amounts of 5 - 530 ng, which can meet the analysis needs of most geological samples and can reduce the test cost of thermal ionization mass spectrometry consumables by about 70%.

The utility model discloses a rapid wiring mechanism for an ion source electrode of a thermal ionization mass spectrometer, which comprises a ceramic fixing frame, an electrode holder and a connecting bolt, the ceramic fixing frame is provided with a connecting part and an electrode holder mounting part, the electrode holder mounting part extends to form a mistake-proof bump, and the electrode holder mounting part is provided with a first connecting screw hole; the electrode holder comprises an electrode holder body and a plurality of probes, the plurality of probes are vertically fixed on the electrode holder body at intervals, the electrode holder body is provided with a groove matched with the mistake-proof bump and a second connecting screw hole matched with the first connecting screw hole, and the connecting bolt detachably penetrates through the first connecting screw hole and the second connecting screw hole; according to the utility model, the ceramic fixing frame and the electrode holder are ensured to have only one installation direction by utilizing the matching of the error-proof convex block and the groove and the matching of the first connecting screw hole and the second connecting screw hole, so that the possibility of installation errors of the ceramic fixing frame and the electrode holder is avoided, and the installation process is simplified.

The utility model discloses a cesium vapor thermal ionization ware, it includes: the shell of cylindrical shape, the middle part of shell is provided with cylindrical negative ion beam flow channel, and the top and bottom of shell are provided with spherical focusing surface and first annular groove respectively, and the side of shell is provided with the through -hole of intercommunication with first annular groove, resistance wire of spring shape, resistance wire is arranged in first annular groove, and both ends of resistance wire all lead out from through -hole, insulating ring, insulating ring sets up in first annular groove, and the top of insulating ring is provided with the second annular groove for containing resistance wire, and the outer edge of second annular groove is provided with the avoidance opening for avoiding both ends of resistance wire, insulating heat -conducting gasket, and insulating heat -conducting gasket is located in the top of insulating ring and is located in first annular groove, the scheme replaces the conventional complex technology that resistance wire and non - heat - conducting alumina are encapsulated respectively in the form of ointment, and then roasting, reduces production cost and production time.

The invention discloses a preparation process of a coating for improving corrosion resistance of a pressure gauge in a special working environment, which belongs to the technical field of surface treatment and comprises the following steps: (1) cold plasma treatment; (2) flame treatment; (3) heating ionization treatment; (4) dispersion treatment; and (5) photochemical treatment. According to the preparation technology of the coating for improving the corrosion resistance of the pressure gauge in the special working environment, raw material matching is reasonable, the method is scientific, cold plasma treatment, flame treatment, ionization treatment and the like are combined, and the finally prepared coating is used for a pressure gauge shell; chemical corrosion resistance such as acid resistance, alkali resistance and salt resistance of the pressure gauge shell can be effectively improved, so that the quality of the pressure gauge shell is remarkably improved, and the service life of the pressure gauge shell is prolonged.

This invention discloses an ultrasonic atomization and flame-assisted thermal ionization method. The method uses the port of the mass spectrometer injection channel, heated by a flame, as the ion source. The sample solution in the sample container is atomized using an ultrasonic atomization device, and the atomized sample moves to the port of the mass spectrometer injection channel for ionization. The thermal ionization method provided by this invention has advantages such as low cost, ease of implementation, wide applicability to various solvents, ability to analyze both polar and non-polar compounds, and the ability to analyze samples at the milliliter level.

The present application relates to the technical field of single crystal impurity detection, and specifically discloses a detection method for shallow energy level impurities of ultrahigh-purity germanium single crystal. After pretreatment of a germanium single crystal sample, photoetching, electron beam evaporation, annealing treatment and ohmic contact treatment are sequentially performed to obtain a sample to be detected, the sample to be detected is placed into a photo thermal ionization spectrometer, photo thermal ionization spectrum of the sample to be detected is obtained, and the impurity type and concentration of shallow energy level impurities of the ultrahigh-purity germanium single crystal are obtained by comparing the spectral line position and intensity of the elements. In the present application, a metal indium film is grown on the upper surface of the germanium single crystal, and the germanium single crystal can detect shallow energy level impurities in the photo thermal ionization spectrometer without adding conductive substances to the lower surface. Meanwhile, the present application uses an acid washing solution with high nitric acid content to perform acid washing treatment on the germanium single crystal, so that the germanium single crystal after acid washing can be tightly combined with the indium film evaporated by the electron beam, and the sample with the indium film loaded on the upper surface prepared has good ohmic contact characteristics.

The utility model provides a sample filament degassing device suitable for a thermal ionization mass spectrometer, and relates to the technical field of filament degassing, the sample filament degassing device comprises an electric heating body, the surface of the electric heating body is sleeved with a detachable filament support, the filament support is internally provided with sixty degassing grooves for accommodating sample filaments, and the degassing grooves are communicated with the electric heating body. Sealing plates for sealing the degassing tank are arranged at the two ends of the degassing tank. The utility model has the advantages that the lamp filament bracket which can be disassembled and assembled is arranged in the vacuum cavity, the sixty degassing grooves for accommodating sample lamp filaments are formed in the lamp filament bracket, and meanwhile, the clamping plate and the electric heating body which can be telescopically adjusted are arranged for fixing and heating the lamp filament bracket; the positions of the clamping plates can be adjusted according to requirements so that the lamp filament support can be conveniently disassembled and assembled, sixty sample lamp filaments can be degassed at a time through the degassing groove, large-batch sample lamp filaments can be degassed conveniently, the working efficiency is improved, and use of the lamp filament degassing device is facilitated.

The utility model relates to the field of mass spectrometry, and discloses a program-controlled sample application device for ion source samples of a thermal ionization mass spectrometer, which comprises a controller, a plurality of air inlets are arranged on the right side of the controller, cleaning components are arranged on the right sides of the air inlets, and the cleaning components are used for preventing the air inlets from being blocked by dust. The rear side of the controller is provided with a wire, the other end of the wire is provided with a program-controlled sample application machine, the top of the program-controlled sample application machine is provided with a plurality of jacks, the interior of each jack is slidably connected with a lamp filament, and the outer sides of two of the lamp filaments are provided with mounting pieces. Two limiting plates are fixedly connected to the top of the program control sample application machine and located below the mounting piece. According to the utility model, the push rod is loosened, the moving block is pushed to reset under the action of the spring, and then the connecting rod is driven to rotate to reset the push rod and the push plate, thereby driving the clamping plate to clamp the filament again, avoiding the problem of lack of stability when the filament is directly inserted, and improving the practicability of the device.

The utility model belongs to the technical field of mass spectrometry, and particularly relates to a structure of a matrix-assisted spark discharge heating ionization sample target, which comprises a target body, a gas input mechanism and a base, the target body is placed on the base, the gas input mechanism is arranged below the base, and a circular positioning groove is formed, so that the gas input mechanism is positioned in the circular positioning groove. Detection personnel can determine the position of a dropwise added sample conveniently, the sample is prevented from deviating from the discharge position of a probe, the detection efficiency is improved, the circular air holes are formed around the circular positioning groove in the center of the target body, input nitrogen flows out of the circular air holes, rapid drying of the sample can be assisted, ionization evaporation of the sample can be assisted, and sample oxidation is avoided; and the mass spectrum detection signal intensity is improved.

The present invention relates to the technical field of nuclear reactor design, and specifically to a gas-cooled nuclear reactor system with series thermal ionization magnetofluid power generation. The system comprises: a reactor core, including a fuel grid, wherein the fuel grid is formed by a plurality of grid unit plates intersecting horizontally and vertically; each of the grid unit plates is a thin plate of fuel; a thermal ionization magnetofluid power generation element, arranged outside the reactor core, for providing a magnetic field to the fuel grid; and a cooling system, for providing a rare gas to the reactor core, configured so that the rare gas exchanges heat with the fuel grid and is converted into a conductive fluid in the generated magnetic field. The conductive fluid flows in the generated magnetic field, generating an induced electromotive force to achieve thermoelectric conversion. While ensuring high thermoelectric conversion efficiency, the present invention improves the engineering feasibility of the gas-cooled nuclear reactor system and solves the problems of gaseous nuclear fuel being prone to corrosion of structural materials, prone to leakage, and difficult post-processing.

The present invention belongs to the field of geological dating, and specifically relates to an improved method for determining the U-Pb age of micron-scale sphene. The present invention confirms the matrix effect related to the Fe2O3 content in sphene dating; and after extensive testing, it is found that the TIMS (thermal ionization mass spectrometer) and SIMS (secondary ion mass spectrometry (SIMS)) test results of sphene standard samples are similar. 206 Pb / 238 The U ratio is strongly correlated with the Fe2O3 mass fraction. Based on this, a direct calibration method for unknown samples was established. 206 Pb / 238 Simplified method of U ratio and correction using similar principles 207 Pb / 235 The deviation between the corrected sphene age and the reference age was reduced from 12.3% to 0.4%, indicating that the corrected age result is more accurate. This method can accurately obtain natural sphene with Fe2O3 content between 0.019% and 38.31%, with the advantages of high accuracy and simple calibration process.

The present invention discloses an ammonia burner, which includes an ammonia heating and ionization device, a second pipe sleeved outside the ammonia heating and ionization device, and a third pipe sleeved outside the second pipe. A primary air duct is formed between the second pipe and the third pipe, and an annular fuel pipe sleeved outside the second pipe is arranged in the primary air duct; the ammonia heating and ionization device is used for heating and ionizing ammonia or ammonia mixed gas, and the air input into the primary air duct and the ammonia output from the fuel nozzle arranged on the annular fuel pipe form a premixed gas in the primary air duct. The present invention realizes the ignition and low-load stable combustion of the ammonia burner through a plasma igniter; the use of the plasma igniter to ionize ammonia effectively avoids the oxidation of the cathode and anode materials of the plasma igniter; the rotating wind formed by multiple circumferential inclined channels at the air outlet of the plasma igniter drives the ionized plasma to generate axial rotation, and under the action of free radicals and high temperature in the plasma, a violent combustion chemical reaction is triggered.

The invention discloses a separated thermal ionization mass spectrometer sample application device, and belongs to the technical field of thermal ionization mass spectrometers, the separated thermal ionization mass spectrometer sample application device comprises a filament heating module, the filament heating module comprises a host shell, the host shell is provided with a plurality of heating stations, and the heating stations are connected in parallel or in series; each heating station comprises a single-band lamp wire band frame and a double-band lamp wire band frame which are connected in parallel; a single-way control switch for controlling each heating station is further installed on the main machine shell, a selection knob and a mode selection switch are further installed on the main machine shell, and the selection knob is provided with channels communicated with the multiple heating stations respectively. The positive electrode of the mode selection switch is connected with one of the single-way control switches or connected with the multiple heating stations, and the negative electrode of the mode selection switch is connected with the selection knob or one of the heating stations. The lamp band frame is small in size, light in weight, low in cost and convenient to operate, and the requirement for simultaneous use of a double-band lamp band frame and a single-band lamp band frame can be met.

The invention discloses a preparation method and application of optical gain flexible thermoelectric ionic gel, and the method comprises the steps: introducing AuNPs coated SiO2 into PAA-Zn-DES ionic gel, and achieving the effect of Seebeck coefficient multiplication under the irradiation of a specific wave band. The main reason of multiple enhancement of the effect is that free electrons on the surface oscillate collectively under the irradiation of a specific wave band of AuNPs (at) SiO2, a strong local surface plasma resonance effect is generated, and a local electric field generated by resonance can enhance the thermal mobility of anions and cations in the gel, so that the Seebeck coefficient is increased.

The utility model relates to the technical field of filament supporting, in particular to a sample filament supporting device suitable for a thermal ionization isotope mass spectrometer. The utility model has the advantages that: on one hand, the ceramic support plate has a structure support effect at high temperature and has good electrical insulation performance at high temperature; the power supply binding post and the filament fixing column which are made of metal materials have good conductive performance at high temperature and need to have good mechanical performance in a high-temperature environment, it is guaranteed that the structure of the filament supporting device is stable and does not deform, and both ceramic and metal have good high-temperature-resistant performance. In the analysis and test process of the thermal ionization isotope mass spectrometer, a single sample filament supporting device can repeatedly detect and analyze more than 30 samples, and the function is still normal; a single sample filament supporting device randomly equipped with an imported instrument generally can only detect and analyze 2-3 samples, and the product price of the lamp filament supporting device is about 30% of the price of an imported product.

The utility model belongs to the technical field of design and manufacture of isotope magnetic mass spectrometers in analytical instruments, and specifically relates to a support column for a mass spectrometer system, which aims to solve the problem that the existing thermal ionization mass spectrometer ion source cavity and the flight flat tube are rigidly connected, resulting in inability to adjust, and the subsequent installation of a bellows is too long but the distance is limited to effectively install it. The utility model includes: a support member, a bellows and a flange; the support member includes a support block and a support plate, the support plate supports the support block, and a connecting hole is opened through the support block; one end of the bellows is inserted into the connecting hole and fixedly connected to the support block, and the other end is fixedly connected to the flange. The utility model solves the problem of no space for installation of two flanges of a separately connected bellows through one-piece welding. The three components are processed separately and welded into one, and the flange is cleverly designed on the support column, which is cleverly designed, space-saving, and easy to install.

The present invention discloses an ion source structure, which includes an ion source chamber, a sample turntable, an ion lens group, and a shielded glove box. The front of the ion source chamber is sealed and connected to the shielded glove box, and a door hole is provided on the front of the ion source chamber, and an ion source chamber door is provided on the door hole. The ion source chamber door is in the shielded glove box and is opposite to the operating surface of the shielded glove box; the sample turntable and the ion lens group are both arranged inside the ion source chamber, and the ion lens group, the sample turntable, the ion source chamber door, and the shielded glove box are linearly arranged in the horizontal direction in sequence. The present invention also discloses a thermal ionization mass spectrometer. The present invention can be applied to the detection of radioactive samples, effectively realizes the isotope abundance or abundance ratio analysis of radioactive samples, and is easy to disassemble, clean and replace, and can ensure long-term and stable operation.

The utility model relates to chemical vapor deposition equipment. The chemical vapor deposition equipment comprises an electron emission device and a reaction device, the electron emission device comprises a thermal ionization mechanism and an anode structure, the thermal ionization mechanism is provided with a thermal ionization cavity and a resistance wire arranged outside the thermal ionization cavity, the thermal ionization cavity is used for containing thermal ionization gas, the resistance wire can heat the thermal ionization cavity, the anode structure is located on one side of the thermal ionization mechanism, and a first through hole is formed in the anode structure. The first through hole is communicated with the thermal ionization cavity, the reaction device comprises a vapor deposition chamber and a reaction gas conveying mechanism, the interior of the vapor deposition chamber is communicated with the end, away from the thermal ionization cavity, of the first through hole, and the reaction gas conveying mechanism is communicated with the interior of the vapor deposition chamber. The electron emission performance of the electron emission device is stable, the cleaning and maintenance frequency of the chemical vapor deposition equipment can be reduced, the ionization performance of the chemical vapor deposition equipment on reaction gas is stable, and the chemical vapor deposition efficiency of the chemical vapor deposition equipment is stable.

The embodiment of the invention discloses a method for detecting Cr isotope in a low-content sample by thermal ionization mass spectrometry. The method comprises the following steps: digesting a sample to obtain a to-be-loaded solution; the method comprises the following steps: cleaning and balancing a quartz glass column filled with AG 50W-X12 resin, loading a sample while the quartz glass column is hot, sequentially adding 1N HCl and collecting, eluting matrix elements by the 1N HCl and the 1N HCl and collecting, and combining collected liquids to obtain a to-be-loaded liquid; the method comprises the following steps: cleaning and balancing a PP micro column filled with AG 50W-X12 resin, loading a sample, sequentially adding 1N HF and 1N HCl to elute matrix elements and 6N HCl, and collecting; single rhenium belt sample application is carried out, and a thermal ionization mass spectrometer is adopted for testing. A stable Cr isotope analysis process which is high in recovery rate, low in blank, high in resolution and few in separation step is established on a thermal ionization mass spectrometry (TIMS) platform, and the method has remarkable advantages in high-precision analysis of low-Cr samples and is suitable for high-precision Cr isotope separation and determination of low-Cr-content samples.

The utility model provides a burnout alarm signal isolation device for a surface thermal ionization ion source power source sample belt, and relates to the technical field of ion source power sources. The device comprises a detection circuit, an alarm circuit and an optical fiber. The detection circuit comprises a detection assembly and an infrared transmitting tube, the input end of the detection assembly is used for being connected with the sample belt interface, and the output end of the detection assembly is connected with the infrared transmitting tube; the alarm circuit comprises an infrared receiving tube and an alarm assembly, the infrared receiving tube is connected with the input end of the alarm assembly, and the output end of the alarm assembly is used for being connected with an upper computer; the two ends of the optical fiber are located in the light-emitting area of the infrared transmitting tube and the light-sensing area of the infrared receiving tube respectively. The abnormal condition is transmitted from the high-voltage side to the low-voltage side through the optical fiber, and the alarm circuit sends an alarm signal to the upper computer, so that the upper computer receives the signal of the low-voltage side, the upper computer cannot be damaged, and the upper computer can operate normally.