16 results about "Electron excitation" patented technology

The invention belongs to the technical field of photoconductive switches, and particularly relates to a phonon auxiliary absorption photoconductive switch and a pulse power system. According to the invention, the main excitation path of electrons is changed, that is, the main path of electron excitation in a photoconductive switch (PCSS) is changed into phonon-assisted inter-band transition from impurity energy level-assisted transition, so that bulk excitation with high photon-generated carrier concentration on the PCSS is realized, a large number of photon-generated carriers are relatively uniformly distributed in a conducting channel of the PCSS, and the photoelectric conversion efficiency of the PCSS is improved. And the voltage conversion efficiency of the PCSS can be obviously improved. In addition, the method can be widely and universally used for the PCSS based on the semiconductor material, and the voltage conversion efficiency of the PCSS based on various semiconductor materials is improved.

The application provides an electron source and a preparation method and application thereof. The electron source comprises an optical fiber, a conductive connecting layer and an electron emission layer. The conductive connecting layer is arranged on the outer surface of the optical fiber. The electron emission layer comprises an electron excitation layer electrically connected with the conductive connecting layer. The electron excitation layer comprises at least one layer of two-dimensional material. The electron excitation layer is arranged on the laser emission path of the optical fiber, and the laser emitted by the optical fiber can directly irradiate on the electron excitation layer, so that the electron excitation layer is excited by the laser and emits electrons. The two-dimensional material as the material of the electron emission layer has the characteristics of good stability and long service life. Moreover, the two-dimensional material can be directly integrated with the optical fiber. The optical fiber can provide a stable excitation source with adjustable wavelength, polarization and optical mode, and can be applied to different application scenarios.

The invention discloses a diacetylene topological chemical reaction method which comprises the following steps: spin-coating a diacetylene solution on a substrate to form a coating film; and irradiating the coating film by adopting an infrared light source, and reacting to generate polydiacetylene. Compared with side reaction and degradation caused by the fact that high-energy rays enable the material to enter an electron excitation state and material fragmentation caused by severe spatial change of molecules under high polymerization, mid-infrared light vibration excitation in the method serves as a means capable of triggering molecular vibration under an electron ground state, and under the mild condition, the mid-infrared light can be used as a means capable of triggering molecular vibration under the electron ground state. Therefore, various bad effects generated in the electron excitation state can be avoided.

The invention relates to the technical field of preparation of catalysts, in particular to a solar-driven CO2 conversion molten medium catalyst, a preparation method and application of the solar-driven CO2 conversion molten medium catalyst in a CO2 trapping and separating system, and the solar-driven CO2 conversion molten medium catalyst comprises the following preparation steps: S1, preparing a modified carrier; s2, molten metal is heated to be completely molten, modified molten salt is added, stirring is conducted, and emulsion is obtained; and S3, adding the modified carrier and copper acetylacetonate into the emulsion, carrying out ultrasonic-assisted dispersion in a molten state, cooling, soaking in an ionic liquid, and drying to obtain the catalyst. The synergistic effect of light and heat is realized in a melting system through the synergistic effect of the modified carrier and the modified molten salt, so that electron excitation initiated by light energy and surface reaction kinetics promoted by heat energy supplement each other, the overall conversion efficiency of CO2 is greatly improved, the dual functions of efficient trapping and in-situ catalytic conversion are achieved, and the catalyst has a good application prospect. Complex procedures of separation, compression and storage after CO2 capture in a traditional process are omitted, and the process flow is remarkably simplified.

The present application includes a scanning electron microscope (15), an observation object ion detection unit (20) that detects an observation object ion, an observation object gas supply unit (19) that supplies an observation object gas to an observation object gas pipe (14) connected to the back surface side of a sample (17), a diaphragm type sample holder (12) that can mount the sample (17) as a diaphragm that separates an analysis chamber (11) and the observation object gas pipe (14), and a control unit (50) that acquires a SEM image while supplying the observation object gas and causing the sample to generate stress by a differential pressure between the analysis chamber (11) and the observation object gas pipe (14), detects the observation object gas that diffuses into the sample and escapes to the surface by electron excitation detachment, and acquires an ESD image of the observation object ion, whereby it is possible to investigate the mechanism of a deterioration phenomenon such as a structure material embrittlement phenomenon caused by the observation object gas.

The application provides an electron source and a preparation method and application thereof. The electron source comprises an optical fiber, a conductive connecting layer and an electron emission layer. The electron emission layer comprises an electron excitation layer electrically connected with the conductive connecting layer. The electron excitation layer comprises a three-dimensional nanomaterial. The electron excitation layer is arranged on a laser emission path of the optical fiber. Laser emitted by the optical fiber can directly irradiate on the electron emission layer, so that the electron excitation layer is excited by the laser and emits electrons. The three-dimensional nanomaterial as the material of the electron emission layer has the characteristics of good stability and long service life. The optical fiber can provide a stable excitation source with adjustable wavelength, polarization and optical mode, and can be applied to different application scenarios.

This invention belongs to the field of gas charge detection technology, specifically relating to a method for measuring the gas ionization coefficient and streamer initiation voltage under wide temperature conditions. The steps include: constructing an experimental system comprising an electrode system, a temperature control system, a laser, a single-photon detection and signal processing module, a streamer voltage measurement device, and auxiliary purification equipment; performing temperature control on the low-temperature and high-temperature sections respectively, and initiating initial electron excitation when the set temperature is reached and stabilized; using the laser for initial electron excitation, collecting the number of photons and photon arrival time, and calculating the ionization coefficient; embedding a tungsten needle tip in the center of the upper surface of the grounding electrode, turning off the laser, increasing the voltage, and monitoring the needle tip current; when the current derivative and current amplitude suddenly increase to meet preset conditions, recording the voltage at a certain temperature T as the streamer initiation voltage U. s (T), the average value of Z repeated measurements is taken as the final value of the streamer initiation voltage. This invention can achieve α and U over a wide temperature range. s High-precision, high-sensitivity measurement.

The invention belongs to the technical field of gas live detection, and particularly relates to a gas ionization coefficient and streamer initial voltage measurement method under a wide temperature condition, which comprises the following steps: building an experiment system comprising an electrode system, a temperature control system, a laser, a single photon detection and signal processing module, streamer voltage measurement equipment and auxiliary purification equipment; performing temperature control on the low-temperature section and the high-temperature section respectively, and performing initial electron excitation when the set temperature is reached and is stable; performing initial electron excitation by using a laser, collecting the photon number and the photon arrival time, and calculating an ionization coefficient; embedding a tungsten needle tip in the center of the upper surface of the grounding electrode, turning off the laser, boosting, and monitoring the current of the needle tip; and when the sudden increase of the current derivative and the current amplitude meets a preset condition, recording the voltage at a certain temperature T as the stream initial voltage Us (T), repeatedly measuring for Z times, and averaging as the final value of the stream initial voltage. According to the invention, high-precision and high-sensitivity measurement of alpha and Us in a wide temperature range can be realized.

The invention belongs to the field of inorganic nanomaterials, and particularly relates to an anti-ferrocene palladium nanocluster material, a method thereof and application of the anti-ferrocene palladium nanocluster material in photothermal conversion performance. The anti-ferrocene palladium cluster disclosed by the invention is a planar metal nanocluster formed on the basis of a Pd5P structural unit, and comprises but is not limited to Pd5-C, Pd5-O, Pd6, Pd8-S and Pd8-P. The cluster structure is similar to the form of a traditional ferrocene compound and has planar aromaticity, but the positions of metal and nonmetal are exchanged. Besides, different from a conventional metal nanocluster with a three-dimensional structure, the anti-ferrocene palladium cluster material with the plane structure has near-infrared absorption (within the ranges of a near-infrared first region and a near-infrared second region), and the maximum absorption wavelength of the anti-ferrocene palladium cluster material mainly originates from electron excitation transition of a cluster metal plane. The unique absorption interval and the electron excitation transition form endow the material with excellent near-infrared light thermal conversion performance.

This invention provides an electromagnetic field detector, a system including the electromagnetic field detector, and a method of operating the electromagnetic field detector. The electromagnetic field detector includes: a first optical signal interface configured to receive a first optical signal from one or more remote light sources; an electromagnetic field transmitter configured to transmit a local oscillator electromagnetic field generated according to the first optical signal, the electromagnetic field transmitter including: a photocurrent generator configured to generate a photocurrent according to the first optical signal; an antenna interface configured to provide the photocurrent to an antenna to transmit the local oscillator electromagnetic field; a second optical signal interface configured to receive a probe optical signal and a coupled optical signal from one or more remote light sources; and a transmission medium. The medium is configured to be excited by a probe optical signal and further excited by a coupling optical signal, wherein the probe optical signal has a probe frequency set to excite electrons in the transmission medium to a first excited state, and the coupling optical signal has a coupling frequency set to excite electrons in the transmission medium to a predetermined Rydberg state to induce an electromagnetically induced transparent (EIT) effect, wherein the transmission medium is further configured to receive a local oscillator electromagnetic field and a phase-modulated electromagnetic field from a remote transmitter, such that the combination of the phase-modulated electromagnetic field and the local oscillator electromagnetic field causes a change in the probe optical signal, and the phase state of the phase-modulated electromagnetic field can be detected according to the change.

The utility model discloses a high-voltage electron gun adopting water cooling to drive an oil cooling composite insulator. The high-voltage electron gun comprises a high-voltage lead-in and electron excitation regulation and control unit and an electron beam electromagnetic regulation and control unit. The device is sequentially provided with a high-voltage cable connection assembly, a first insulation assembly, a second insulation assembly and an electronic excitation assembly. A silicon rubber sleeve is arranged in the first insulation assembly, and interface discharge is inhibited through air-gap-free sealing connection; the second insulating assembly is filled with insulating oil and is wound with a snakelike water-cooling pipe so as to improve the insulation and heat dissipation performance. The electron excitation assembly is composed of an anode, a grid electrode and a cathode and used for electron beam emission. And the electron beam electromagnetic regulation and control unit is provided with a beam channel, an axis combining coil, a focusing coil and a scanning coil and is used for realizing beam quality regulation and control. The structure integrates the oil cooling channel and the water cooling channel, not only can the connection mode between the high-voltage cable and the insulator of the electron gun be simplified and the reaction between the insulating material of the high-voltage cable and the insulating oil be avoided, but also the working stability of the electron gun can be improved by utilizing the mode of driving the oil cooling by the water cooling.

The application provides a flow field density measurement method based on femtosecond laser electron excitation marking, which comprises the following steps: firstly, a laser pulse is emitted by a femtosecond laser, and a time delay generator is used to control the laser emission time; secondly, the laser pulse is focused on a measurement area by a frequency conversion module, a mirror group and a focusing lens device; thirdly, a camera with an added optical filter is arranged on the side of the measurement area and in a 90° direction with the laser transmission direction, and the camera is used to filter and collect the fluorescence signals generated by the femtosecond laser excited particles; finally, the density information of the flow field in the measurement area is deduced according to the fluorescence signal decay time information collected by the camera. The operation process of the application is simple, the measurement result is accurate, the flow field density can be measured while the influence on the flow field property is extremely small, the arrangement of the measurement device is simplified in the research on complex flow problems such as hypersonic flow, and the application is suitable for promotion and application.

The application discloses a method for diacetylene topological chemical reaction, which comprises the following steps: spin-coating a diacetylene solution on a substrate to form a coating film; and irradiating the coating film with an infrared light source to generate polydiacetylene through reaction. Compared with the side reactions and degradation caused by high-energy rays which make materials enter an electronic excited state, and the material fragmentation caused by the violent spatial change of molecules under high polymerization, the mid-infrared light vibration excitation in the method can be used as a means for initiating the vibration of molecules in an electronic ground state, and can be more widely close to a potential energy surface under mild conditions, so that various adverse effects generated in the electronic excited state can be avoided.

An organic electroluminescent device that comprises a first electrode, a second electrode, and an organic emission layer EML comprising: one metal-organic host compound MOH, and one organic emitter compound OE. The metal-organic host compound MOH has a total spin of ≥½ and / or possessing one or more unpaired electrons. The lowest electronically excited state within the emission layer EML is an exciplex EXMOH / OE formed by a single electron transfer between the MOH and the OE. The energy of the first excited triplet state of the organic emitter T1OE is resonant or higher as compared to the energy of the Exciplex EEEX: T1OE≥EEEX. The energy difference of the emitting first excited singlet state S1OE and the energy of the exciplex is less than 0.4 eV: S1OE−EEEX≤0.4 eV.

An NMR-DNP probe head comprises a probe holder for receiving a sample vessel containing a sample substance surrounded by an RF coil, a temperature control device for maintaining the temperature of the sample substance, a microwave guide for supplying microwave radiation into the sample volume, and an illumination device comprising an optical fiber for photoinduced electron excitation of the sample substance in the sample volume. The temperature control device comprises a VT channel through which temperature control fluid can be supplied to the sample vessel during NMR measurement to maintain the temperature of the sample substance, the sample-side end of the optical fiber is arranged in the VT channel, and a deflecting mirror is arranged in the VT channel between the sample-side end of the optical fiber and the sample vessel that directs light exiting the optical fiber onto the sample substance in the sample volume of the sample vessel.