78 results about "Thermal ionization" patented technology

The invention relates to the feeding of analyte ions, generated at atmospheric pressure, efficiently into the mass spectrometer. The invention provides a lengthy ion mobility drift tube with a focusing electric field inside to guide the ions from an ionization cloud generated at atmospheric pressure towards the entrance opening of the mass spectrometer, and to dry droplets which might occur in the ionization cloud by a hot drying gas flowing through the ion mobility drift tube towards the ionization cloud.

The invention provides a thermal ionization time-of-flight mass spectrometer and a thermal ionization time-of-fight mass spectrometric analysis method, and belongs to the technical field of mass spectrometric analysis. The thermal ionization time-of-flight mass spectrometer is mainly composed of an ion source, an ion transmission system and a vertical reflection type time-of-flight mass analyzer. The thermal ionization time-of-flight mass spectrometer is used, an analysis sample is arranged in the ion source and fixed on a filament band on a sample frame, currents of the filament band are increased to enable the sample to be ionized, ion beams are transmitted and modulated by an ion transmission lens assembly in the ion transmission system and reach the vertical reflection type time-of-flight mass analyzer, ions with different masses reach a detector after different flight time, and the qualitative and quantitive analysis or the isotope analysis of the sample is achieved. According to the thermal ionization time-of-flight mass spectrometer and the thermal ionization time-of-fight mass spectrometric analysis method, isotope abundance can be quickly and accurately measured, impurity elements are monitored, and an innovative mass spectrometric analysis technology is achieved.

A system for measuring in-cylinder parameters utilizing an image charge measured in an engine cylinder by an in-cylinder pressure sensor due to chemi and or thermal ionization in Engine. The in-cylinder pressure sensor includes a sensing element, which is a metal sensor probe with a selective coating (e.g., metal, oxides of metal, native oxides, semiconductor, oxides of semiconductors, ceramics, glass, dielectric, etc., in the form of a coating on the metallic probe, tube, etc) in order to function in harsh, corrosive and / or elevated temperature environments. The output of the sensor can be connected to a signal-conditioning unit, which includes a low noise differential charge amplifier with an auto offset correction circuit to measure fast varying signals. The signal out from the conditioning unit can be acquired utilizing a high-speed microcontroller-based data acquisition system with suitable software to analyze and estimate parameters such as, for example, in cylinder pressure and knocking.

A system and method for controlling knock in a lean burn internal combustion (IC) engine includes a spark plug having an electrode, and an electrical circuit configured to provide a first voltage to the electrode and detect an ion current during a thermal-ionization phase of the combustion process, and provide a second voltage to the electrode to create a spark and initiate a combustion process within a combustion chamber. The engine includes a controller configured to monitor the ion current for a knock condition that includes at least an incipient knock condition, determine a spark crank angle timing of the IC engine where the incipient knock occurs, and adjust the spark timing of the IC engine to operate at a crank angle that does not exceed a threshold level beyond an incipient knock set point.

The invention discloses a uranium isotope abundance measurement method by using carbon nanotubes as an ion emission agent, which comprises the following steps: (1) sample preparation: preparing a carbon nanotube suspension, and pretreating a rhenium strip; (2) sample coating: putting the evaporation rhenium strip on a sample coating device, dripping a uranium solution onto the evaporation rhenium strip, drying, and cooling to room temperature; coating the carbon nanotube suspension on the uranium sample, drying the evaporation rhenium strip, cooling to room temperature, and loading onto a rotary table; and (3) sample measurement: sending the rotary table into an ion source, starting a mass spectrometer, and after the ion current signal intensity reaches the maximum and the signal stays in the most stable state for 3-5 minutes, starting data acquisition of uranium isotope abundance measurement. By using the carbon nanotubes as the ion emission agent for uranium isotope abundance measurement, the invention improves the ion emission property of trace uranium sample in thermal ionization mass spectrometer measurement; and by optimizing the burning strip used by the carbon nanotubes as the emission agent as well as experimental conditions for sample preparation, testing and the like, the invention establishes a novel method for measuring the abundance of trace uranium isotope.

A device to place an incision into matter with a harmonious plasma cloud. A radiofrequency generator system produces pulsed or continuous electromagnetic waveform which is transmitted by an active transmitter incising electrode tip. This generated electromagnetic wave is utilized to initiate a plasma cloud with processes such as thermal ionization and a photoelectric effect which then trigger an Avalanche Effect for charged atomic particles at the surface of the active transmitter incising electrode tip. This electromagnetic wave is impedance matched, frequency matched, power matched and tuned to the plasma cloud in order to sustain and control a harmonious plasma cloud with reduced atomic particle turbulence and chaos. This harmonious plasma cloud forms a coating over the surface of the active transmitter electrode tip as well as acts to reduce the energy needed from the power amplifier of our plasma cutting device. The electromagnetic wave is also used to produce a Pinch Effect to compress, contour, shape and control the harmonious plasma cloud. The electromagnetic wave is furthermore used to trap and contain the plasma cloud without the need of a solid matter containment vessel according to the Magnetic Bottle Effect of physics and a generated centripetal electric field force that acts to pull plasma particles inward toward the activated incising electrode tip. The Tunnelling Effect of physical chemistry is utilized to focus and amplify the energy delivered to the harmonious plasma cloud while shielding matter surrounding the intended path of incision from potential electromagnetic radiation exposure. The invention is an efficient, effective, safe, clean and inexpensive device which can be used to place an incision in matter.

The invention discloses a chemical ionization mass spectrometer for selectively controlling reaction ions, which comprises an ion source, a reaction ion selecting cavity, a chemical ionization reaction cavity and a mass spectrum detecting cavity, wherein the ion source is used for generating mixed ions; a certain ion in the mixed ions can selectively pass through the reaction ion selecting cavity; two parallel-plate electrodes are arranged in the reaction ion selecting cavity; and the parallel-plate electrodes are connected with a controllable radio-frequency power supply. According to the chemical ionization mass spectrometer provided by the invention, the mixed ions are separated by controlling radio-frequency voltage alternating current components loaded on the parallel-plate electrodes and a direct current component is utilized to select one ion, so as to realize the selective control on the passing of any ion; the ion enters the chemical ionization reaction cavity and is served as the reaction ion for chemical ionization, so as to realize the ionization on a to-be-detected object and detect in the mass spectrum detecting cavity; the chemical ionization mass spectrometer provided by the invention can work under atmosphere pressure and has the characteristics of simplicity in technology and low cost; various reaction ions are selectively controlled and the scope of materials detected by the chemical ionization mass spectrometer is expanded; and the identifying analytical capability of an instrument on unknown samples is increased.

The invention aims at providing a method for online-analyzing organic monomer chlorine or bromine isotope, which adopts a direct negative chemical ionization to replace an original complex organic monomer conversion process. The method is characterized by including the steps: A. gathering chlorine or bromine substitute; B. separating gas chromatography: placing the gathered chlorine or bromine substitute into the gas chromatography to be separated; C. conducting negative chemical ionization: components analyzed through chromatography directly flow into a negative chemical ion source through acapillary column, the negative chemical ion source replaces an original electron bombardment source configured on an isotope ratio mass spectrum to conduct the negative chemical ionization; D. mass spectrometric detecting: on a gas isotope ratio mass spectrum, selecting a faraday receiving cup corresponding to mass number of chlorine or bromine substitute directly, and receiving electronegative isotope fragment ions generated by the negative chemical ionization. The process is conducted under high vacuum state, and degree of vacuum is higher than 1.0*10<-3> Pa. The method greatly simplifies aprocess of online-analyzing organic monomer chlorine or bromine isotope and can form various special devices for detecting organic monomer isotope ratio.

A system and method for controlling knock in a lean burn internal combustion (IC) engine includes a spark plug having an electrode, and an electrical circuit configured to provide a first voltage to the electrode and detect an ion current during a thermal-ionization phase of the combustion process, and provide a second voltage to the electrode to create a spark and initiate a combustion process within a combustion chamber. The engine includes a controller configured to monitor the ion current for a knock condition that includes at least an incipient knock condition, determine a spark crank angle timing of the IC engine where the incipient knock occurs, and adjust the spark timing of the IC engine to operate at a crank angle that does not exceed a threshold level beyond an incipient knock set point.

The invention relates to a mass spectrum analysis instrument, in particular to a vacuum ultraviolet photoionization and chemical ionization compound ionization source based on radio frequency electric field enhancement of quadrupole rods. The vacuum ultraviolet photoionization and chemical ionization compound ionization source based on radio frequency electric field enhancement of the quadrupole rod comprises a vacuum ultraviolet light source and an ionization chamber cavity; a plurality of transmission electrodes, the quadrupole rods and vacuum differential hole electrodes are coaxially arranged in an ionization chamber in a spaced mode; a metal grid mesh is attached to the transmission electrode far away from an ultraviolet light inlet, ultraviolet light emitted by the vacuum ultraviolet light source is irradiated to the metal grid mesh and phoelectrons are generated; direct-current voltage and radio frequency voltage are applied to the quadrupole rods. On the basis of vacuum ultraviolet photoionization, the compound ionization source ionizes reagent gas through the phoelectrons generated through the photoelectric effect, and therefore chemical ionization happens to samples through reagent ions; through the radio frequency electric field of the quadrupole rods, ionization efficiency of chemical ionization caused by the phoelectrons can be improved; besides, chemical compounds with ionization higher than vacuum ultraviolet light photon energy can be ionized through chemical ionization, and the range of the chemical compounds capable of being ionized is widened.

A system and method for controlling knock in a lean burn internal combustion (IC) engine includes a spark plug having an electrode, an electrical circuit, and a controller. The electrical circuit is configured to provide a first voltage to the electrode and detect an ion current during a thermal-ionization phase of the combustion process, and provide a second voltage to the electrode to create a spark and initiate a combustion process within the combustion chamber. The controller is configured to monitor the ion current for a knock condition that includes at least an incipient knock condition, determine a crank angle of the IC engine where the incipient knock occurs, and adjust timing of the IC engine to operate at a crank angle that does not exceed a threshold level beyond inception of incipient knock.

The invention discloses a thermal ionization plasma generation test device. The thermal ionization plasma generation test device comprises a closed explosion chamber, an optical fiber probe, a spectrometer, a sensor, a pressure regulation valve and a data processing system, wherein the closed explosion chamber comprises a combustion chamber, an optical window and an ignition device, a receiving port of the optical fiber probe is aligned to the optical window, the spectrometer is connected with the optical fiber probe and is used for data collection, the sensor is arranged inside the combustion chamber and can be used for measuring temperature and pressure in the combustion chamber, the pressure regulation valve is arranged at one end of the combustion chamber, and the data processing system is connected with the sensor, the pressure regulation valve and the spectrometer separately and is used for processing data and regulating plasma density. The invention discloses thermal ionization plasma density test and control methods. The thermal ionization plasma generation test device has the characteristics of simple structure of a test system, wide measurement range and the like and is convenient to use; and moreover, with the adoption of non-contact measurement, no interference is generated to plasma, accurate test also can be achieved in a high-temperature and high-pressure environment, and the plasma density can be regulated during the test process.

Provided are an organic-inorganic-hybrid perovskite nanocrystal particle light-emitter having a two-dimensional structure, a method for producing the same, and a light emitting device using the same. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter having a two-dimensional structure comprises an organic-inorganic-hybrid perovskite nanocrystal structure having a two-dimensional structure which can be dispersed in an organic solvent. Accordingly, the nanocrystal particle light-emitter comprises an organic-inorganic-hybrid perovskite nanocrystal having a crystal structure combining FCC and BCC; forms a lamellar structure where organic planes and inorganic planes are accumulated in an alternating manner; and can exhibit high color purity by confining excitons in the inorganic planes. In addition, since the exciton diffusion distance decreases and exciton binding energy increases, it is possible to prevent exciton annihilation caused by thermal ionization and delocalization of charge carriers, such that the nanocrystal particle light-emitter can have high luminescence efficiency at room temperature.

The invention relates to a method for producing a gas phase heavy phosphorus-doped float zone silicon single crystal. The method comprises float zone gas phase heavily doping and crystal pulling processes. In the process, a water-cooled electromagnetic copper coil with double waterways is adopted so that the temperature of the coil can be controlled between 10 and 20 DEG C; therefore, the coil is prevented from being damaged by a chemical reaction of phosphorus and the copper coil at a high temperature; and simultaneously the problem of a coil spark caused by thermal ionization of phosphorus impurities near the coil is solved. The gas phase heavy phosphorus-doped float zone silicon single crystal produced by the method has the characteristics of: oxygen content below 1ppm, axial resistivity uniformity of within + / -10 percent and resistivity of 0.002 Ohm.cm, well meets the strict requirement of a transient voltage suppressor (TVS) on a silicon substrate material, and meets the requirement of a TVS device on the silicon substrate material.

A system for measuring in-cylinder parameters utilizing an image charge measured in an engine cylinder by an in-cylinder pressure sensor due to chemi and or thermal ionization in Engine. The in-cylinder pressure sensor includes a sensing element, which is a metal sensor probe with a selective coating (e.g., metal, oxides of metal, native oxides, semiconductor, oxides of semiconductors, ceramics, glass, dielectric, etc., in the form of a coating on the metallic probe, tube, etc) in order to function in harsh, corrosive and / or elevated temperature environments. The output of the sensor can be connected to a signal-conditioning unit, which includes a low noise differential charge amplifier with an auto offset correction circuit to measure fast varying signals. The signal out from the conditioning unit can be acquired utilizing a high-speed microcontroller-based data acquisition system with suitable software to analyze and estimate parameters such as, for example, in cylinder pressure and knocking.

The invention discloses a Nd and Sm separation method applied to Nd isotopc analysis of a thermal ionization mass spectrum. The method comprises the following steps of sample dissolving, in which a sample is dissolved to obtain a 3mol / L of HNO3 medium sample solution; and chemical separation, in which the sample solution is loaded onto an exchange column which is filled with 1.0ml of TODGA levextrel resin, 10ml 3mol / L of HNO3 is used to wash out basic elements including Fe, Mg, Al, K, Na, Cr, Ti and Ba, 10mL 11mol / L HNO3 is used to wash out Ca, 15ml 2.5mol / L HCl is used to wash out interference elements including La, Ce and Pr, 6mL 2mol / L of HCl is used to analyze Nd, and 5mL 0.5mol / L HCl is used to analyze Sm. According to the method, neodymium and samarium can be separated from a geologic sample by one column, Nd and Sm obtained by separation are high in purity and recovery rate, the method is rapid and efficient, and the flow background is low.

The invention relates to a method for coupling a large-area perovskite solar cell module with a thermoelectric power generation device module which is not smaller than the area of a cell. According to the method, the thermoelectric power generation device module and the large-area perovskite solar cell module are connected in series or in parallel and overlapped to form a composite module. The method has the advantages that: 1) the utilization efficiency of light energy and heat energy in solar energy can be improved, namely, the perovskite solar cell module mainly utilizes ultraviolet and visible light wave bands, the thermoelectric generation device mainly utilizes infrared light (heat energy) and waste heat generated by self photoelectric conversion and thermal ionization of the solar cell, so that the power output of the module is improved, and the maximum output power of the composite module is improved by 24 percent compared with that of a single solar cell module; 2) the thermoelectric module can timely take away the waste heat generated due to long-time illumination of the solar battery and working, so that the solar battery module keeps a constant temperature, the service life of the solar battery module is prolonged, and higher and more stable output power is obtained.

The invention discloses a closed bomb vessel for plasma diagnosis. The closed bomb vessel comprises a combustion chamber, two closed devices, a plasma gas generation device, a pressure relief device and an optical visual window, wherein the combustion chamber is made of gun steel, the two closed devices are separately arranged on the two sides of the combustion chamber, the plasma gas generation device is arranged at one end of the combustion chamber and is also arranged inside the closed device at the end, the pressure relief device is arranged inside the closed device at the other end of the combustion chamber and is used for leading out a high-pressure gas in the closed bomb vessel, and the optical visual window is arranged at the top of the combustion chamber and is used for an operator to observe plasma distribution condition in the combustion chamber. By the closed bomb vessel, gunpowder can be detonated in a high-temperature and high-pressure closed environment, and plasma generated after explosion is collected; thermal ionization plasma is diagnosed by a spectroscopy method, the quality of gunpowder is adjusted, and thus, the plasma density is regulated; and the adjustment is accurate and rapid, and the maneuverability is high.

The invention relates to a method for eliminating cyanic acid radical disturbance in boron isotope thermal ionization mass spectrosoopy, which includes following steps: when using thermal ionization mass spectroscopic detection coat, the restraining agent and boron isotope are coated on the sample according to any proportion to carry on boron isotope detection; the method in the invention is to restrain the synthesis of CNO- and Cs2CNO+ion and eliminate the disturbance of CNO- and CS2CNO+ion to boron isotope detection.

A device to place an incision into matter with a harmonious plasma cloud. A radiofrequency generator system produces pulsed or continuous electromagnetic waveform which is transmitted by an active transmitter incising electrode tip. This generated electromagnetic wave is utilized to initiate a plasma cloud with processes such as thermal ionization and a photoelectric effect which then trigger an Avalanche Effect for charged atomic particles at the surface of the active transmitter incising electrode tip. This electromagnetic wave is impedance matched, frequency matched, power matched and tuned to the plasma cloud in order to sustain and control a harmonious plasma cloud with reduced atomic particle turbulence and chaos. This harmonious plasma cloud forms a coating over the surface of the active transmitter electrode tip as well as acts to reduce the energy needed from the power amplifier of our plasma cutting device. The electromagnetic wave is also used to produce a Pinch Effect to compress, contour, shape and control the harmonious plasma cloud. The electromagnetic wave is furthermore used to trap and contain the plasma cloud without the need of a solid matter containment vessel according to the Magnetic Bottle Effect of physics and a generated centripetal electric field force that acts to pull plasma particles inward toward the activated incising electrode tip. The Tunnelling Effect of physical chemistry is utilized to focus and amplify the energy delivered to the harmonious plasma cloud while shielding matter surrounding the intended path of incision from potential electromagnetic radiation exposure. The invention is an efficient, effective, safe, clean and inexpensive device which can be used to place an incision in matter.

The invention relates to a chemical ionization and photoionization composite source mass spectrometer-based volatile organic matter detection device and detection method. The device comprises a discharge ion source, photoionization lamps, a reaction tube with a gradually-decreasing inner diameter, a transition cavity, a mass spectrometer cavity, a transition cavity molecular pump, a mass spectrometer cavity molecular pump, a fore pump, an alternating current / direct current composite power source, a sample injection opening, an ion detection mass spectrometer, a gas source and the like. According to the detection method of the invention, chemical ionization and photoionization of ion and molecular reaction are adopted, so that the simultaneous dual ionization of various volatile organic matters can be realized; the mass spectrometer is adopted to realize online high-sensitivity detection; and since the multi-dimensional ionization and high-sensitivity mass spectrometry detection of thevolatile organic matters are realized by chemical ionization and photoionization, the defect of difficulty in detecting alkane volatile organic matters of chemical ionization such as proton transfer reactions and the defect of low efficiency under a vacuum condition of photoionization can be eliminated; and full-coverage, high-sensitivity, simultaneous and on-line detection of non-alkane volatileorganic matters and alkane volatile organic matters can be realized.

A system and method for controlling knock in a lean burn internal combustion (IC) engine includes a spark plug having an electrode, an electrical circuit, and a controller. The electrical circuit is configured to provide a first voltage to the electrode and detect an ion current during a thermal-ionization phase of the combustion process, and provide a second voltage to the electrode to create a spark and initiate a combustion process within the combustion chamber. The controller is configured to monitor the ion current for a knock condition that includes at least an incipient knock condition, determine a crank angle of the IC engine where the incipient knock occurs, and adjust timing of the IC engine to operate at a crank angle that does not exceed a threshold level beyond inception of incipient knock.

The present invention refers to a surface ionization detector comprises an emitter, a heating rod, a collecting electrode, a reducing liner and a housing. The emitter is made of molybdenum, platinum or alloy, and in the form of cylinder or a wire spiral. The heating rod heats and supports the metal emitter. When the heating rod is heated to 300-500° C., organic amine compounds collide with the surface of the emitter, generating positive ions through surface thermal ionization and thus are detected. The lowest detecting limit value of tertiary amine by the detector in the present invention can achieve to 10−14 g / s. The response to other hydrocarbons, ketones, etc., is 5-6 orders of magnitude lower than that of organic amines. The detector can selectively detect amines, hydrazines and their derivatives, and so on. The detector can be used as a detector for a gas chromatography system adopting capillary column or packed column, or alternatively be used alone as a sensor.

The invention discloses a high-sensitivity emitter and method for a thermal ionization mass spectrometer for the ultra-micro sample strontium isotope test and employs silicotungstic acid and phosphoric acid as high-sensitivity cast charges for the thermal ionization mass spectrometer. The method is advantaged in that properties of high sensitivity, low cost and simple operation are realized, the method is an important innovation of ultra-micro sample strontium isotope analysis, compared with a traditional analysis method, a sample consumption ratio is 1-50ng, the method only needs 30-200pg toobtain satisfactory test accuracy, test sensitivity is greatly improved, and the method has wide application prospects.

The invention belongs to the field of measurement of molybdenum isotope abundance, and more particularly relates to a method for measuring the negative thermal ionization mass spectrometry of molybdenum isotope abundance. The method comprises the three steps of rhenium strip sample coating, temperature raise measurement and data correction. According to the method disclosed by the invention, a negative thermal ionization mass spectrometry measuring method is adopted, a double-rhenium-strip assembly is used, and a SrCl2 solution is used as a cast charge. The method disclosed by the invention solves the technical problems of large sample coating amount, long measuring time and larger relative standard deviation of a measuring result in the prior art. According to the method disclosed by the invention, all index parameters are relatively balanced, thus the technical effects of smaller sample coating amount, short measuring time and smaller relative standard deviation of the measuring result are achieved; and the method is particularly suitable for measuring requirements of a radioactive sample and a biological sample with low cost.

The tail-gas strong-ionization and purifying gas production assisted zero-emission energy saving machine master device referring to a multiple comprehensive purifying and treatment device which is used for high-efficiency zero emission purification of biological degradation-resistant organic waste liquid high in pollution, toxicity and concentration and waste tail gas. The tail-gas strong-ionization and purifying gas production assisted zero-emission energy saving machine master device comprises a fuel steam system which heats organic waste liquid water alcohol high in pollution, toxicity and concentration by waste heat of waste tail gas, a plasma high-energy electron, high-energy discharge catalyzing and high-energy ionization synergic purifying system which catalyzes and purifies of the waste tail gas, a thermal ionization purifying system which can burn and purify in an ultrahigh burning and purifying pulse manner by the waste tail gas, a high-energy fuel and gas optical catalyzing and purifying system which can transform carbon dioxide purified by high-energy electronic high-photoelectricity into fuel, and an energy saving device combustion-supporting assistance complete-burning system which can produce mixed gas high-energy fuel by organic waste liquid high in pollution, toxicity and concentration and water alcohol steam via waste heat to increase power of an engine. The tail-gas strong-ionization and purifying gas production assisted zero-emission energy saving machine master device is applicable to an internal combustion engine.

The invention relates to a method for determining boron isotopic composition with static double-receiving method by a positive thermal ionization mass spectrometry, wherein the 309 and 308 ion peaks are statically received simultaneously by two Faraday cups by adjusting the two parameters of FocusQard and DispersionQuad in a focusing optical system, and the determination of high-accuracy boron isotopic composition is finished. The method comprises the following steps: (1) determining the FocusQard and DispersionQuad parameters in ion source optical focusing; (2) determining the two parallel cups and cup parameters of a Faraday receiver; (3) and determining the receiving mass number of the central cup of the Faraday receiver. The method establishes a method for determining boron isotopic composition using double-Faraday-cup static receiving method without changing high-pressure parameter and Faraday cup hardware setting; compared with dynamic peak skip-scanning method, the data acquisition time is greatly shortened, and the sensitivity and inner and outer accuracies of the determination of boron isotopic composition using positive thermal ionization method are improved.

The invention belongs to the technical field of chemical detection methods and in particular relates to a specific method for determining boron-10 abundance in boron and a compound by adopting a thermal ionization isotope mass spectrometry. According to the technical scheme provided by the invention, the method for determining the boron-10 abundance in the boron and the compound by adopting the thermal ionization isotope mass spectrometry is established. A sample application manner of a sample is selected, the concentration of a standard reagent is calibrated, an optimal interval of temperature rising current and optimal time of current temperature rising and the like are determined, so that 3mg of boron carbide powder is enriched and is used as a determination testing material; the precision of the method is better than 0.01 percent. The method is accurate and reliable and the requirements of analytical technique indexes of a project are met.

The invention aims at providing a method for online-analyzing organic monomer chlorine or bromine isotope, which adopts a direct negative chemical ionization to replace an original complex organic monomer conversion process. The method is characterized by including the steps: A. gathering chlorine or bromine substitute; B. separating gas chromatography: placing the gathered chlorine or bromine substitute into the gas chromatography to be separated; C. conducting negative chemical ionization: components analyzed through chromatography directly flow into a negative chemical ion source through a capillary column, the negative chemical ion source replaces an original electron bombardment source configured on an isotope ratio mass spectrum to conduct the negative chemical ionization; D. mass spectrometric detecting: on a gas isotope ratio mass spectrum, selecting a faraday receiving cup corresponding to mass number of chlorine or bromine substitute directly, and receiving electronegative isotope fragment ions generated by the negative chemical ionization. The process is conducted under high vacuum state, and degree of vacuum is higher than 1.0*10<-3> Pa. The method greatly simplifies a process of online-analyzing organic monomer chlorine or bromine isotope and can form various special devices for detecting organic monomer isotope ratio.

The invention relates to a selectivity sensor for measuring volatility amine, hydrazine and derivatives thereof by adopting a surface thermal ionization theory, and comprises the assembly such as an emitting electrode, and a collector and the like in a shell, wherein the emitting electrode is prepared from molybdenum or platinum or alloy materials and is a filament-winding or cylindrical structure; a heating rod heats a metal electrode of the emitting electrode and supports the emitting electrode; or the emitting electrode and the collector are two plates arranged in parallel. When the emitting electrode is heated to 350-480DEG C in the air, the air, amine or hydrazine or other compositions diffuse in the sensor, are collided with the surface of the emitting electrode, and only if the surface ionization of the amine and the hydrazine generates a positive ion, the measurement is carried out. The minimum measured amount of the sensor to the tertiary amine is less than 2 mu g / m<3>, and the invention can be used for on-site measurement of a compound of the volatility amine and toxic amine.