CN103871828A - Array type photoelectric transmission ionizing source and application thereof - Google Patents
Array type photoelectric transmission ionizing source and application thereof Download PDFInfo
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- CN103871828A CN103871828A CN201210555423.0A CN201210555423A CN103871828A CN 103871828 A CN103871828 A CN 103871828A CN 201210555423 A CN201210555423 A CN 201210555423A CN 103871828 A CN103871828 A CN 103871828A
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Abstract
The invention discloses an array type photoelectric transmission ionizing source for an ion migration tube. The source is characterized in that the array type photoelectric transmission ionizing source is designed and utilized, and the limitation of the single photoelectric transmission ionizing source is broken through; the light intensity is greatly improved, the number of ions in the ionizing area is greatly increased, and the sensitivity of the ion migration tube is effectively improved; the electric field of the reaction area is more uniform, the utilization rate of ions is improved, and the sensitivity of the ion migration tube is improved.
Description
Technical field
The present invention relates to a kind of array photoelectricity transmitting ionization source, be applied to the sensitivity that can effectively improve transference tube in transference tube, obtain than the better effect of single photoelectric emission ionization source.
Background technology
Conventional ion migration spectrum ionization source used is
63ni radioactive ionization gauge source,
63ni can radiate the β particle that average energy is 17Kev, and the high energy electron of generation bumps and reacts with carrier gas, and finally forming reagent ion is H
+(H
2o)
n(cation detecting pattern) and O
2 -(H
2o)
n(anion detecting pattern), reagent ion reacts with testing sample again, makes determinand ionization.Radioactivity power supply because of stable performance, volume is little, noise is little, easy and simple to handle, do not need the advantages such as additional power source extensively to be favored, but its radiation problem give operation, transport, process and all make troubles, simultaneously its range of linearity is narrow, selectivity is bad.Therefore many on-radiation substitutional ions in this year source is applied in ion mobility spectrometry, has light ionization source (comprising light discharge lamp VUV lamp and laser), corona discharge ionization source and electron spray ionisation source etc.
Ultra violet lamp can produce photoelectric effect to metal, obtains low-energy photoelectron, and the electron capture detector in chromatogram is these photoelectrons of application.Photoelectric effect only produces low-energy photoelectron, there is no cation, therefore can effectively stop the recombination reaction between cation and electronics and cation and anion, simplifies the reaction in ionization source, makes to obtain spectrogram simple.Deliver and reported based on uviol lamp photoelectric emission at AnalyticalChemistry in 2010, ionization source in ion mobility spectrometry, described ionization source structure is that uviol lamp is equipped with metal grid mesh, this ultraviolet light photo transmitting ionization source is placed in the direction axially paralleling with migration tube, forms photoelectric emission ion mobility spectrometry.This photoelectric emission ion mobility spectrometry takes full advantage of photoelectric effect and photochemical reaction, can realize two kinds of detecting patterns of positive and negative ion by positive or negative high voltage power supply, the experiment proved that and can effectively reduce detectability, improves sensitivity.
Summary of the invention
The object of this invention is to provide a kind of array photoelectricity transmitting ionization source being applied in ion mobility spectrometry, this ionization source has several uviol lamps, utilize UV illumination to penetrate and on metal bar, produce photoelectric effect and irradiate the photochemical reaction that carrier gas produces, obtain larger improvement at single photoelectric emission ionization source device before, can effectively improve the sensitivity of ion mobility spectrometry.
For achieving the above object, the technical solution used in the present invention is:
A kind of array photoelectricity transmitting ionization source, it is characterized in that: the cylindric lamp socket that comprises both ends open, on cylindric lamp socket cylinder side wall, be radially provided with plural through hole, in each through hole, be equipped with ultraviolet light source, central axis in cylindric lamp socket is provided with metal bar, be provided with ring-type repulsion electrode in an openend of cylindric lamp socket, repulsion electrode is coaxial with cylindric lamp socket, and the emergent light of ultraviolet light source irradiates on metal bar.
The central axis of described plural through hole is on the same radial section of cylindric lamp socket.
Described metal bar is positioned at the circle ring center that several uviol lamps surround, and several uviol lamps are surrounded on metal bar 360 and spend symmetrical.
The radius R of the annulus of several uviol lamps and metal bar composition should be less than ultraviolet light light path L, and the less ionization effect of R is better.
Described ultraviolet source is the equipment that vacuum UV lamp, diode, xenon lamp, mercury lamp or ultraviolet laser etc. can produce uviol lamp; The material of metal bar is that various electron work functons are less than the one in metal and the alloy of ultraviolet source ionization energy.
Described through hole and ultraviolet source number are 2-8.
Described ionization source is as the ionization source of ionic migration spectrometer, one openend of the cylindric lamp socket of described ionization source is provided with carrier gas inlet, another openend is provided with repulsion electrode, ultra violet lamp can produce photoelectron to metal bar according to photoelectric effect, photoelectron reacts with carrier gas and produces reagent ion, reagent ion reacts with determinand, makes determinand ionization.The ionization of determinand can also can be carried out at positive ion mode under negative ion mode, and positive and negative ion pattern can realize by positive and negative high voltage source.Positive ion mode is that directly photo ionization forms cation in the time that determinand molecular ionization can be lower than the ionization energy of ultraviolet source; Under negative ion mode, ionize by two kinds of modes: 1, photoelectron is adsorbed onto on determinand, make its ionization 2, photoelectron be adsorbed onto the photochemically reactive product O of carrier gas
3upper, obtain O
3 -, O
3 -or its hydrated ion O
3 -(H
2o)
ncan be used as reagent ion, also can react with other inorganic molecules in carrier gas and generate reagent ion.
Carrier gas is high pure nitrogen or air.
Advantage of the present invention
This array photoelectricity transmitting ionization source is applied in ion mobility spectrometry, advantage is compared with the ionization source of the electric transmitting of monochromatic light before: array photoelectricity transmitting ionization source can increase considerably irradiation light intensity, compare than single photoelectric emission ionization source, can greatly improve ionizing efficiency, increase number of ions; Metal bar, compared with metal grid mesh before, can make ionized region electric field more even, improves ion utilance simultaneously, and two aspects can improve the sensitivity of ion mobility spectrometry effectively.
Brief description of the drawings
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail:
Fig. 1 is two-burner lamp photoelectric emission ionization ion mobility spectrometry schematic diagram, and this instrument mainly comprises following components: ultraviolet source 1, ultraviolet source 2, metal bar 3, cylindric lamp socket 4, repulsion electrode 5, ion gate 6, migration tube 7, becket 8, aperture plate 9, sample carrier gas 10, make-up gas 11, gas vent 12, farad chassis 13, amplifier 14, A/D converter 15, data handling system (as oscilloscope) 16.
Fig. 2 is array photoelectricity transmitting ionization ion mobility spectrometry streamer mode schematic diagram.
Embodiment
The present invention has utilized the photoelectric effect of UV-irradiation metal generation and has irradiated the photochemical reaction that carrier gas produces, on single photoelectric emission ionization source basis, designing array photoelectricity transmitting ionization source before, as shown in the figure, it mainly comprises following a few part to array ionization source structure: ultraviolet source 1, ultraviolet source 2(ultraviolet source 1 and 2 can identical wavelength also can different wave length), metal bar 3 and cylindric lamp socket 4.Ultraviolet source can be the equipment that vacuum UV lamp, diode, xenon lamp, mercury lamp, ultraviolet laser etc. can produce ultraviolet light, here taking vacuum UV lamp as example; The material of metal bar is mainly the one that various electron work functons are less than the metal or alloy of ultraviolet source ionization energy; Lamp socket uses nonmetallic materials, and as processable ceramic, polytetrafluoroethylene etc., metal bar is positioned at lamp socket central axis place, and several uviol lamps are placed in lamp socket and are surrounded on metal bar 360 spends symmetrical.This array photoelectricity transmitting ionization source is applied in ion mobility spectrometry, an openend in lamp socket is provided with carrier gas inlet, be provided with make-up gas entrance in one end, ion mobility spectrometry farad chassis, in being provided with gas vent near on the transference tube sidewall of repulsion electrode.
As shown in Figure 2, carrier gas enters from lamp socket one openend streamer mode in array photoelectricity emitting ions migration tube, and make-up gas enters migration tube from the farad extreme end of chassis, and last gas vent from migration tube repulsion electrode is emptying.
Sample gas under the positive ion mode of ionization source or negative ion mode with carrier gas crash response, the sample ions that ionization obtains, the ion gate that sample ions is opened by pulse enters migration area, difference according to its mobility in migration area is separated, finally arrive Faraday plate, the ion signal being received by Faraday plate sends signal acquiring and processing system to.
Claims (8)
1. an array photoelectricity transmitting ionization source, it is characterized in that: the tubular lamp socket that comprises both ends open, on tubular lamp socket cylinder side wall, be radially provided with plural through hole, in each through hole, be equipped with ultraviolet light source, central axis in tubular lamp socket is provided with metal bar, be provided with ring-type repulsion electrode in an openend of tubular lamp socket, repulsion electrode is coaxial with tubular lamp socket, and the emergent light of ultraviolet light source irradiates on metal bar.
2. ionization source according to claim 1, is characterized in that:
The central axis of described plural through hole is on the same radial section of tubular lamp socket.
3. according to ionization source described in claim 1 or 2, it is characterized in that:
Described metal bar is positioned at the circle ring center that several uviol lamps surround, and several uviol lamps are surrounded on metal bar 360 and spend symmetrical.
4. ionization source according to claim 1, is characterized in that: the radius R of the annulus of several uviol lamps and metal bar composition should be less than ultraviolet light light path L, and the less ionization effect of R is better.
5. ionization source according to claim 1, is characterized in that: described ultraviolet source is the equipment that vacuum UV lamp, diode, xenon lamp, mercury lamp or ultraviolet laser etc. can produce uviol lamp; The material of metal bar is that various electron work functons are less than the one in metal and the alloy of ultraviolet source ionization energy.
6. ionization source according to claim 1, is characterized in that: described through hole and ultraviolet source number are 2-8.
7. described in a claim 1, ionize to come from ion mobility spectrometry and apply, it is characterized in that: described in claim 1, ionization source is as the ionization source of ionic migration spectrometer, described in claim 1, an openend of the cylindric lamp socket of ionization source is provided with carrier gas inlet, another openend is provided with repulsion electrode, ultra violet lamp can produce photoelectron to metal bar according to photoelectric effect, photoelectron reacts with carrier gas and produces reagent ion, and reagent ion reacts with determinand, makes determinand ionization.
8. application according to claim 7, is characterized in that: carrier gas is high pure nitrogen or air.
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| CN201210555423.0A CN103871828B (en) | 2012-12-17 | 2012-12-17 | A kind of array photoelectricity transmitting ionization source and application thereof |
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| CN104535499A (en) * | 2015-01-14 | 2015-04-22 | 成都海兰天澄科技有限公司 | Sulfur dioxide online monitoring method |
| CN105632865A (en) * | 2014-10-28 | 2016-06-01 | 中国科学院大连化学物理研究所 | Non-radioactive ion migration tube |
| CN106504973A (en) * | 2017-01-03 | 2017-03-15 | 公安部第研究所 | A kind of transference tube of the integration based on ceramic material |
| CN108091538A (en) * | 2016-11-23 | 2018-05-29 | 中国科学院大连化学物理研究所 | A kind of integrated form vacuum UV lamp ionization source difference ionic migration spectrometer |
| CN111220683A (en) * | 2018-11-25 | 2020-06-02 | 中国科学院大连化学物理研究所 | Method for real-time online monitoring of exhaled propofol |
| CN114388340A (en) * | 2022-01-11 | 2022-04-22 | 深圳市步锐生物科技有限公司 | Array type ion source for mass spectrum |
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| CN111220683A (en) * | 2018-11-25 | 2020-06-02 | 中国科学院大连化学物理研究所 | Method for real-time online monitoring of exhaled propofol |
| CN114388340A (en) * | 2022-01-11 | 2022-04-22 | 深圳市步锐生物科技有限公司 | Array type ion source for mass spectrum |
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Effective date of registration: 20230202 Address after: No. 909B, Huangpu Road, High-tech Industrial Park, Dalian, Liaoning, 116000 Patentee after: Jinkai instrument (Dalian) Co.,Ltd. Address before: 116023 No. 457, Zhongshan Road, Liaoning, Dalian Patentee before: DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES |
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