CN1238715C - Storing type photo-ionisation ion migration mass spectrum - Google Patents

Storing type photo-ionisation ion migration mass spectrum Download PDF

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Publication number
CN1238715C
CN1238715C CN 200310106393 CN200310106393A CN1238715C CN 1238715 C CN1238715 C CN 1238715C CN 200310106393 CN200310106393 CN 200310106393 CN 200310106393 A CN200310106393 A CN 200310106393A CN 1238715 C CN1238715 C CN 1238715C
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grid electrode
ion
ionization
memory
electrode
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CN1544931A (en
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李海洋
阚瑞峰
邵士勇
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Anhui Institute of Optics and Fine Mechanics of CAS
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Anhui Institute of Optics and Fine Mechanics of CAS
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Abstract

The present invention relates to a storing type photoionisation ion migration mass spectrum. The present invention mainly solves the problems existing in the prior art that radioactive elements are used as ionization sources so that the measured line spectrums are complicated, and the obtained signals are weak. The storing type photoionisation ion migration mass spectrum comprises an acceleration grid mesh electrode, an ionization light source, a sampling opening, an ionization area, a drift area and an ion collection plate. The present invention is characterized in that the ionization light source is a vacuum ultraviolet lamp, and a memory area structure is arranged between the ionization area and the drift area to replace an ion gate. The present invention has the function of storing ions, so monitoring sensibility is greatly enhanced; the drift mass spectrograms of objects to be measured are clear, the influence of noises is reduced, and the efficiency of collection is enhanced.

Description

The memory-type optical ionization ion mobility mass spectrometer
Technical field
The present invention relates to a kind of mass spectrometer, be specifically related to a kind of optical ionization ion mobility mass spectrometer.
Background technology
Ion mobility mass spectrometer is a kind of mass spectrometer of under atmospheric pressure working.Its principle is: under the atmospheric pressure, under the effect of Weak Uniform Electromagnetic field E, ion can be along the direction accelerated motion of electric field force, constantly bump again simultaneously with gas molecule, consequently ion drifts about with certain speed V, and wherein v is: v=KE, K are the transfer rate constants of reduction.Under low field intensity, the mobility constant K of ion is the constant of molecular structure character, and is irrelevant with electric field intensity.The speed difference that the ion of so different migration rates moves in the drift region, they arrive the asynchronism(-nization) of detector.Detect the different size of current of detector constantly and just obtain the different pairing signals of ion that arrive the detection device constantly.
Existing ion mobility mass spectrometer generally be with the Ni63 radioelement as ionization source, the β particle ability that Ni63 ionization environment-development is penetrated can be up to tens KeV, not only can ionization volatile organic contaminant and explosive and drug numerator, but also can be N 2, O 2With water vapour ionization, N 2, O 2The ion that produces with water vapour ionization be easy to sample gas in organic contaminant, explosive or drug numerator generation ion molecule reaction, obtain multiple product, thereby make the spectral line that records very complicated.The ion that ionized region produces arrives the drift region by ion gate.
Ion gate is in closed condition all the time before beginning to analyze, and the ion that ionization source produces can not arrive detector through producing scattering behind the ion gate; Ion gate is opened one very short period in the time of will analyzing ion, and then ion is directly by ion gate, again through arriving detector behind the drift region.Ion gate wherein has not a particle of the effect of storage to ion, the signal that obtains a little less than.
Summary of the invention
In order to solve in the prior art owing to adopting radioelement to make the line spectrum complexity that records as ionization source, the problem that the signal that obtains is more weak, the invention provides a kind of memory-type optical ionization ion mobility mass spectrometer, it has ion storing function, can obtain the migration mass spectrogram of determinand clearly.
The present invention comprises for realizing the technical scheme that its purpose provides: the present invention relates to a kind of memory-type optical ionization ion mobility mass spectrometer, comprise and quicken grid electrode, ionization light source, injection port, ionized region, drift region and ion collection plate, the ionization light source is a vacuum UV lamp, it is characterized in that establishing between ionized region and drift region ion storage plot structure substitution ion door, the ion storage district is made of grid electrode.Mainly constitute by preceding grid electrode, middle grid electrode and back grid electrode.Described vacuum UV lamp, its energy that produces photon is 10.6ev.Described grid electrode is a kind of ring electrode, title electrode retaining collar, and its external diameter is 45～55mm, and internal diameter is 35～45mm, and the stainless steel ring of thick 2～4mm, aperture plate are the chemical etching nickel screen, and thickness is 0.1～0.3mm.Described acceleration grid electrode meets high pressure HV all the time 1, grid electrode is in the memory phase time T before the ion storage district 1Voltage is HV 2, with grid electrode equipotential in the middle of the memory block, and HV 1＞HV 2, grid electrode HV behind the memory block 3Grid electrode in the middle of being higher than, HV 3＞HV 2Elapsed time T 1After, before the memory block, add a high voltage pulse PV on the grid electrode, elapsed time T 2After, add a high voltage pulse PV on the middle grid electrode, HV 2+ PV＞HV 3
Principle of work of the present invention: vacuum UV lamp is as ionization source, produces the photon of 10.6ev, can ionization ionization energy be lower than the molecule of 10.6ev, but can not ionization N 2, O 2And water vapour, thereby significantly reduced the kind of ion, obtain the migration mass spectrogram of gem-pure determinand.In addition owing to adopted ion storage structure substitution ion door, thus the sensitivity that has improved the migration Mass Spectrometer Method.
Beneficial effect of the present invention: have ion storing function, improve the sensitivity of monitoring greatly, determinand migration mass spectrogram is clear, has reduced The noise, has improved collection efficiency.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a voltage sequential chart of the present invention.
Fig. 3 is aperture plate of the present invention and electrode synoptic diagram.
Among the figure 1, quicken grid electrode, 2, vacuum UV lamp, 3, preceding grid electrode, 4, middle grid electrode, 5, back grid electrode, 6, the power supply of vacuum UV lamp, 7, electrode retaining collar, 8, high-voltage power supply one, 9, grid electrode, 10, the drift gas inlet, 11, plate electrode, 12, the ion collection plate, 13, the drift region, 14, micro current amplifier, 15, data acquisition system (DAS), 16, the pulse daley generator, 17, the drift region divider resistance, 18, high-voltage power supply two, 19, amplifier, 20, the voltage transitions system, 21, quicken the grid electrode divider resistance, 22, injection port, 23, the ion storage district, 24, ionized region, 25, electrode retaining collar, 26, aperture plate.
Embodiment
As shown in Figure 1, ionization light source of the present invention adopts vacuum UV lamp 2, and its energy that produces photon is 10.6ev.The ion storage district is by preceding grid electrode 3, and middle grid electrode 4 and back grid electrode 5 are formed.Electrode is a kind of ring electrode, claims electrode retaining collar, and its external diameter is 50mm, and internal diameter is 40mm, and thick is the stainless steel ring of 3mm, and aperture plate is the nickel screen of chemical etching, and thickness is 0.2mm, as shown in Figure 3.Acceleration grid electrode 1 connects the output terminal of high-voltage power supply 1, i.e. high-pressure side.Plate electrode 11 connects the ground end of high-voltage power supply 1.Sample gas enters ionized region 24 through injection port 22, wherein ionization energy be lower than 10.6ev molecule by vacuum UV lamp 2 ionization, moved in the source by the effect of electric field force to the right at the positive ion that quickens to produce between grid electrode 1 and the preceding grid electrode 3, arrive the ion storage district.
Quicken grid electrode 1 and meet high pressure HV all the time 1, grid electrode 3 is in the memory phase time T before the ion storage district 1Voltage is HV 2, with grid electrode 4 equipotentials in the middle of the memory block, and HV 1＞HV 2Move this moment under the effect of ion at electric field force that ionized region produces, arrive the ion storage district, field free region promptly between grid electrode 3 and the middle grid electrode 4, because the collision of ion and drift gas causes most of ion to rest on the memory block and does thermal motion, the current potential HV of grid electrode 5 behind the memory block at this moment 3Be higher than target 4 (HV 3＞HV 2), leave the memory block even therefore do the ion of thermal motion, see through middle grid electrode 4, under the effect of the electric field force between back grid electrode 5 and the middle grid electrode 4, still can get back to the memory block, the noise of having avoided a small amount of ion that sees through the memory block to produce like this.At elapsed time T 1After, before the memory block, add a high voltage pulse PV on the grid electrode 3, the then ion of memory block migration to the right under the effect of electric field force, elapsed time T 2After, add a high voltage pulse PV on the middle grid electrode 4, grid electrode 4 in the middle of at this moment the ion of memory block has passed, because, HV 2+ PV＞HV 3Then ion grid electrode 5 after drift taking place under the effect of electric field force pass the memory block enters the ion drift district.Preceding, the middle aperture plate and the electrode potential thereof of memory block revert to HV afterwards 2, enter the ion storage stage again.The voltage sequential of work as shown in Figure 2.
Ion through the drift region after, different ions passes grid electrode 9 in the different time and arrives ion collection plate 12, the ion collection plate is between grid electrode 9 and plate electrode 11, between grid electrode 9 and plate electrode 11, there is a potential difference (PD), therefore the ion that passes grid electrode 9 can continue to be collected to the motion of ion collection plate direction under the effect of electric field force, obtains testing spectrogram then after amplifier, data acquisition system (DAS).

Claims (5)

1, memory-type optical ionization ion mobility mass spectrometer, comprise and quicken grid electrode, ionization light source, injection port, ionized region, drift region and ion collection plate, the ionization light source is a vacuum UV lamp, it is characterized in that between ionized region and drift region, establishing ion storage plot structure substitution ion door, the ion storage district by before, during and after three grid electrodes constitute.
2, memory-type optical ionization ion mobility mass spectrometer according to claim 1 is characterized in that described vacuum UV lamp, and its energy that produces photon is 10.6ev.
3, memory-type optical ionization ion mobility mass spectrometer according to claim 1, it is characterized in that described grid electrode is a kind of ring electrode, title electrode retaining collar, its external diameter is 45～55mm, internal diameter is 35～45mm, the stainless steel ring of thick 2～4mm, aperture plate is the chemical etching nickel screen, and thickness is 0.1～0.3mm.
4,, it is characterized in that described acceleration grid electrode (1) meets high pressure HV all the time according to claim 1,2 or 3 described memory-type optical ionization ion mobility mass spectrometers 1, grid electrode before the ion storage district (3) is in the memory phase time T 1Voltage be H V2, with grid electrode (4) equipotential in the middle of the memory block, and HV 1＞HV 2, grid electrode behind the memory block (5) HV 3Grid electrode (4) in the middle of being higher than, HV 3＞HV 2
5, memory-type optical ionization ion mobility mass spectrometer according to claim 4, it is characterized in that elapsed time T1 after, add a high voltage pulse PV, elapsed time T on the grid electrode before the memory block (3) 2After, add a high voltage pulse PV, HV on the middle grid electrode (4) 2+ PV＞HV 3
CN 200310106393 2003-11-20 2003-11-20 Storing type photo-ionisation ion migration mass spectrum Expired - Fee Related CN1238715C (en)

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WO2009092185A1 (en) * 2007-12-27 2009-07-30 Nuctech Company Limited An ion mobility spectrometry and its method

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CN102954995A (en) * 2011-08-19 2013-03-06 中国科学院大连化学物理研究所 Non-uniform electric field based ion mobility spectrometer
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WO2009092185A1 (en) * 2007-12-27 2009-07-30 Nuctech Company Limited An ion mobility spectrometry and its method

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