CN103887141B - A kind of ionic migration spectrometer - Google Patents
A kind of ionic migration spectrometer Download PDFInfo
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- CN103887141B CN103887141B CN201410114963.4A CN201410114963A CN103887141B CN 103887141 B CN103887141 B CN 103887141B CN 201410114963 A CN201410114963 A CN 201410114963A CN 103887141 B CN103887141 B CN 103887141B
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- 238000009791 electrochemical migration reaction Methods 0.000 title claims abstract description 28
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 15
- 239000012159 carrier gas Substances 0.000 claims description 13
- 238000002242 deionisation method Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 91
- 230000005684 electric field Effects 0.000 description 13
- 238000013508 migration Methods 0.000 description 10
- 230000005012 migration Effects 0.000 description 10
- 239000000523 sample Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001871 ion mobility spectroscopy Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000003012 network analysis Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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Abstract
The invention discloses a kind of ionic migration spectrometer, comprise ring electrode, lower ring electrode, central electrode, detecting electrode and shield grid, upper ring electrode and the relative and setting with one heart up and down of lower ring electrode, central electrode is positioned at the home position of ring electrode, between central electrode and upper ring electrode and lower ring electrode, form ion source region, between detecting electrode and upper ring electrode and lower ring electrode, form ion drift district, detecting electrode comprises sets cylindrical lateral parts, and shield grid is conductor and between ion drift district and detecting electrode; Shield grid is used for, and is applied in the voltage that is less than central electrode voltage in the time that central electrode voltage is greater than detecting electrode voltage, is applied in the voltage that is greater than central electrode voltage in the time that central electrode voltage is less than detecting electrode voltage. This ionic migration spectrometer has the higher degree of accuracy and higher sensitivity.
Description
[technical field]
The present invention relates to ion migration detection field, be specifically related to a kind of ionic migration spectrometer.
[background technology]
Ionic migration spectrometer (IMS, IonMobilitySpectrometry) be a kind of based on ion in electric fieldThe instrument that the difference of migration velocity detects sample material. Sample is ionized to sample ions in ionization device,And be introduced in the drift region that has linear DC electric field, make by gaseous ion difference of migration velocity in electric fieldInterionic is separated from one another, thereby realizes separation and sign to different sample ions.
The microminiaturization of ionic migration spectrometer is a kind of main trend, gradually by vehicular, desktop computer to portable, hand-heldLight Instrument Development. Existing ionic migration spectrometer adopts linear pattern migration tube more, and all ions have identical motionDirection. For the ion gun that produces divergence form ion, as laser ionization source etc., linear pattern instrument just can only gather whereinPart ion. On the other hand, in ion drift process, there are diffusion phenomena, increase the loss of transmitting procedure. According toIon mobility spectrometry theory, the now resolution ratio of ionic migration spectrometer and sensitivity all will reduce. Therefore, especially in inspectionWhile surveying the ion that divergence form ion gun produces, need to adopt a kind of collar plate shape ion mobility spectrometry that can 360 ° of collection of ionsInstrument.
Publication number is 1513114 to disclose a kind of radial disk type ion mobility spectrometer, but this migration meter is detectingThere is the inaccurate problem of testing result in Shi Rongyi.
[summary of the invention]
In order to overcome the deficiencies in the prior art, one of them object of the present invention is to provide a kind of ionic migration spectrometer to carryThe degree of accuracy that macroion detects; Another one object is to provide a resolution ratio and all good ion mobility spectrometries of the degree of accuracyInstrument.
A kind of ionic migration spectrometer, comprises ring electrode, lower ring electrode, central electrode, detecting electrode and shieldingGrid, described upper ring electrode and the relative and setting with one heart up and down of lower ring electrode, described central electrode is positioned at described pressed on ringThe home position of shape electrode, forms ion source region, institute between described central electrode and upper ring electrode and lower ring electrodeState between detecting electrode and described upper ring electrode and lower ring electrode and form ion drift district, described detecting electrode comprisesSet cylindrical lateral parts, described shield grid be conductor and be positioned at described ion drift district and described detecting electrode itBetween;
Described shield grid is used for, and is applied in and is less than central electrode voltage in the time that central electrode voltage is greater than detecting electrode voltageVoltage, in the time that central electrode voltage is less than detecting electrode voltage, be applied in the voltage that is greater than central electrode voltage.
In one embodiment, the voltage that described shield grid is applied in equals the electromotive force of described shield grid present position.
In one embodiment, described ionic migration spectrometer has multiple upper ring electrodes and multiple lower ring electrode,Described multiple upper ring electrode arranges with one heart, has corresponding gap, at described center between adjacent upper ring electrodeOn electrode, described multiple upper ring electrodes and described detecting electrode, apply successively the voltage of monotone variation; Described multipleLower ring electrode arranges with one heart, between adjacent lower ring electrode, has corresponding gap, lower ring electrode and upper ring-typeElectrode is oppositely arranged between two, on described central electrode, described multiple lower ring electrodes and described detecting electrode successivelyApply the voltage that monotone variation is identical, described shield grid is positioned at upper ring electrode and the detecting electrode of close detecting electrodeBetween.
In one embodiment, the voltage phase that every group of upper ring electrode being oppositely arranged up and down and lower ring electrode are applied inWith.
In one embodiment, every group of upper ring electrode being oppositely arranged is up and down identical with lower ring electrode.
In one embodiment, also comprise for stoping or allowing ion to enter the ion fence gate in ion drift district, described inThe shape of ion fence gate is certain cylindrical side, and described ion fence gate arranges and is positioned at upper ring electrode is concentricFrom the inner side of the nearest upper ring electrode of described central electrode, described ion gun district is positioned at described ion fence gate inner side.
In one embodiment, ion is introduced in described ion source region for generation of ion or from outside.
In one embodiment, the gap between adjacent upper ring electrode is identical with pressure drop, adjacent lower ring electrodeBetween gap identical with pressure drop.
In one embodiment, also comprise carrier gas inlet, drift gas entrance, the outlet of drift gas and carrier gas outlet, described inDrift gas entrance is near detecting electrode setting, and described carrier gas inlet, the outlet of drift gas and carrier gas outlet are arranged at ion gunDistrict.
By adopting shield grid, make detecting electrode can not produce the induced-current being caused by drift ion, thereby avoidError detection, improved the accuracy detecting; That be oppositely arranged and be applied with the upper and lower of gradient voltage by arranging many groupsRing electrode, the electric field line of each position, drift region is all very even, ensures the ion tool from each position of ion gunThere is identical drift time, thereby in ensureing detection resolution, improve the degree of accuracy detecting; And adopt similarDiscoid ionic migration spectrometer, can collect the ion of all angles, moves thereby reduce line-like type ionMove the divergence loss in the ion motion of spectrometer, the sensitivity that has improved instrument.
[brief description of the drawings]
Fig. 1 is the generalized section of the ionic migration spectrometer of an embodiment of the present invention;
Fig. 2 is the schematic top plan view of the ionic migration spectrometer of Fig. 1;
Fig. 3 is the ionic migration spectrometer of a kind of embodimentPartElectric Field Simulation schematic diagram;
Fig. 4 is the Electric Field Simulation schematic diagram only in prior art with the ionic migration spectrometer of one group of annular electrode.
[detailed description of the invention]
Below the preferred embodiment of invention is described in further detail.
As illustrated in fig. 1 and 2, the ionic migration spectrometer of a kind of embodiment, comprise central electrode 2, upper ring electrode, underRing electrode, shield grid 5, detecting electrode 6 and ion fence gate 7, described upper ring electrode and lower ring electrode phase up and downRight, be the central electrode 2 of wire through the center of circle of upper ring electrode and lower ring electrode, wherein going up ring electrode canThere are multiple ring electrodes with phase concentric of outwards arranging successively: ring-type on ring electrode 11, second on firstElectrode 12 ... and ring electrode 15 on the outermost of the most close detecting electrode 6, correspondingly, lower ring electrode also has manyThe individual ring electrode with phase concentric: first time ring electrode 13, second time ring electrode 14 ... the most outside lower ring-type electricityThe utmost point 16; Region on central electrode 2, first between ring electrode 11 and first time ring electrode 13 forms ion gunDistrict 3, upper ring electrode (ring electrode 12 on ring electrode 11, second on first ... ring electrode 15 on outermost), lower ring electrode(first time ring electrode 13, second time ring electrode 14 ... the most outside lower ring electrode 16) and detecting electrode 6 between form ionDrift region 4, detecting electrode 6 can be certain cylindrical lateral parts, central electrode 2 is arranged in detecting electrode 6Axle position, shield grid 5 is conductors and between described ion drift district 4 and detecting electrode 6, is preferably placed atBetween outside upper ring electrode 15 and detecting electrode, preferably, shield grid 5 is certain cylindrical lateral parts.
Ion is introduced in ion source region 3 for generation of ion or from outside, when ion source region 3 is during for generation of ion,Detected sample enters ion source region 3 from ion source region entrance 31, is then ionized; When ion source region is used for from outsideWhile introducing ion, detected ion enters ion source region 3 from ion source region entrance 31 under the effect of carrier gas.
Ion fence gate 7 is for stoping or allowing ion to enter ion drift district 4, and the shape of ion fence gate 7 is certain cylinderThe side of body, central electrode 3 is positioned at this cylindrical central shaft position, and be positioned at decentre electrode 2 nearest firstThe inner side of upper ring electrode 11, described ion source region 3 is positioned at ion fence gate 7 inner sides.
By measured ion, all before ion source region 3, (for example ionization does not complete, or also to ion gun when allDistrict 3 introduces ion), ion fence gate 7 is applied in certain voltage, be for example not less than the voltage that central electrode 2 is identical (whenDetected while being cation), ion cannot be gone out ion source region 3 and enter ion drift district 4; When all testedIon is all positioned at behind ion source region 3, separates the voltage of deionization fence gate 7, and ion can and detect at central electrode 2Under the effect of the electric field between electrode 6, arrive detecting electrode 6 through ion drift district 4 from ion source region 3.
Between adjacent upper ring electrode, there is corresponding gap, set gradually from central electrode 2 to detecting electrode 6The voltage monotone variation that upper ring electrode is applied in; Between adjacent lower ring electrode, there is corresponding gap, from centerThe voltage monotone variation that the lower ring electrode that electrode 2 to detecting electrode 6 sets gradually is applied in, that is to say, therefromThe voltage that the upper ring electrode that heart electrode 2 to detecting electrode 6 sets gradually is applied in diminishes successively, so, and from centerThe voltage that the lower ring electrode that electrode 2 to detecting electrode 6 sets gradually is applied in also diminishes successively, and 5 of shield gridsThe most outside lower ring electrode 16 of ring electrode 15(on the outermost of the most close detecting electrode 6) and detecting electrode 6 between.Preferably, the gap between adjacent upper ring electrode is identical with pressure drop, the gap between adjacent lower ring electrode andPressure drop is identical.
Because ion is not before arriving detecting electrode 6 through ion drift district 4, can on detecting electrode, produce inductionElectric current, thus make to produce false signal on detecting electrode 6, the accuracy that impact detects. When central electrode 2When voltage is greater than the voltage of detecting electrode 6, shield grid 5 is applied in the voltage that is less than central electrode 6 voltages, works as centerWhen electrode 2 voltages are less than detecting electrode 6 voltage, shield grid 5 is applied in the voltage that is greater than central electrode 2 voltages, excellentSelection of land, the voltage that shield grid 5 is applied in equals the electromotive force of shield grid 5 present positions, like this, due to shield grid 5Shielding, thus induced-current on detecting electrode 6, can not produced, and ion also can be at central electrode 2 to detectionUnder the effect of the electric field between electrode 6, smoothly by shield grid 5, and then arrive detecting electrode 6.
Preferably, the shape size of the upper ring electrode that each group is oppositely arranged is up and down identical, and is arranged in electrocardioCentered by the utmost point 2, on the side of the same cylinder of axle, each organizes the upper ring electrode and the lower ring-type electricity that are oppositely arranged up and downThe voltage that the utmost point is applied in is identical. Like this, the electric field of ion drift district 4 interior formation is comparatively even, makes identical ionFrom ion source region 3 diverse locations, the transit time that arrives detecting electrode 6 through ion drift district 4 is identical. AsShown in Fig. 3, be internal field's schematic diagram of this programme, electric field line 41 is evenly distributed in ion drift district 4In.
Preferably, the width of each annular electrode is identical, between 0.01-20mm, adjacent upper ring electrode (underRing electrode) between gap between 0.1 to 100mm, being spaced apart between every group of ring electrode setting up and down1-100mm。
And as a comparison, as shown in Figure 4, be in documents, only to adopt one group of relative electrode 11 ' and 13 ', electricityThe schematic diagram of the electric field line 41 ' of the electric field between the utmost point 2 ' and detecting electrode 6 '. Ionic migration spectrometer is to exist according to different ionsTransit time difference in the electric field in ion drift district is distinguished ion. The much the same ion transit time of mass-to-charge ratio is poorSeldom, if migration distance is shorter, the time of these ions arrival detectors (detecting electrode) is almost identical, can notEffectively distinguish ion, so the migration distance in ion drift district is longer, the resolution ratio of instrument is higher. Ensureing necessarilyThe prerequisite of migration distance under, if only have an annular electrode, require the radial width of annular electrode larger,Can cause like this electric field line of drift region extremely inhomogeneous, as shown in Figure 4, same ion is from the diverse location of ionized regionWhile setting out, can cause transit time seriously different, thereby affect the detection of ion; If reduce this annular electrodeWidth, although electric field line is relatively even, can cause again ion migration distance to reduce, and the resolution ratio of instrument is lower,Can not detect well ion.
Therefore, by adopting many groups annular electrode opposing upper and lower, not only increase the migration distance of ion, improve and differentiateRate; And greatly weaken the inhomogeneities of drift region electric field, while guaranteeing same ion from drift region diverse location,Transit time is identical.
Ionic migration spectrometer can also comprise that carrier gas inlet (being ion source region entrance 31), drift gas entrance, drift gas go outMouthful and carrier gas outlet, described drift gas entrance arranges near detecting electrode 6, described carrier gas inlet, drift gas export andCarrier gas outlet is arranged at ion source region, and as shown in Figure 1, the dotted line of bending represents the drift path of gas of drifting about, thereby blowsWalk the neutral particle in ion drift district 4, drift gas can be selected air or nitrogen. Straight dotted line represents by carrier gasInflow direction, ion to be detected can enter ion source region under the effect of carrier gas, solid line represents floating of ionMove path.
Arrive the ion of detecting electrode 6, through ion detection network analysis, finally form ion mobility spectrometry figure, analyzeGo out the composition of testing sample.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assertSpecific embodiment of the invention is confined to these explanations. For general technical staff of the technical field of the invention,Without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to thisInvention is by the definite scope of patent protection of submitted to claims.
Claims (7)
1. an ionic migration spectrometer, is characterized in that: comprise ring electrode, lower ring electrode, central electrode, inspectionSurvey electrode, shield grid, for stoping or allowing ion to enter the ion fence gate in ion drift district, described upper ring electrodeWith the relative and setting with one heart up and down of lower ring electrode, described central electrode is positioned at the home position of described upper ring electrode,Between described central electrode and upper ring electrode and lower ring electrode, form ion source region, described detecting electrode and described onBetween ring electrode and lower ring electrode, form ion drift district, described detecting electrode comprises sets cylindrical side surface partPoint, described shield grid is conductor and between described ion drift district and described detecting electrode;
Described shield grid is used for, and is applied in and is less than central electrode voltage in the time that central electrode voltage is greater than detecting electrode voltageVoltage, in the time that central electrode voltage is less than detecting electrode voltage, be applied in the voltage that is greater than central electrode voltage;
Ion is introduced in described ion source region for generation of ion or from outside; Described central electrode is wire;
The shape of described ion fence gate is certain cylindrical side, described ion fence gate and upper ring electrode be concentric to be arranged,And be positioned at the inner side of the upper ring electrode nearest from described central electrode, described ion gun district is positioned at described ion fence gateSide;
When all by measured ion all before ion source region, ion fence gate is applied in certain voltage; When all tested fromSon is all positioned at behind ion source region, separates the voltage of deionization fence gate.
2. ionic migration spectrometer as claimed in claim 1, is characterized in that: the voltage applying on described shield grid equalsThe electromotive force of described shield grid present position.
3. ionic migration spectrometer as claimed in claim 1, is characterized in that: described ionic migration spectrometer have multiple onRing electrode and multiple lower ring electrode, described multiple upper ring electrodes arrange with one heart, adjacent upper ring electrodeBetween there is corresponding gap, at described central electrode, describedly comply with on ring electrode and described detecting electrode on multipleThe inferior voltage that applies monotone variation; Described multiple lower ring electrode arranges with one heart, between adjacent lower ring electrode, hasCorresponding gap, lower ring electrode and upper ring electrode are oppositely arranged between two, described central electrode, described multiple underOn ring electrode and described detecting electrode, apply successively the voltage that monotone variation is identical, described shield grid is positioned at the most closeBetween the upper ring electrode and detecting electrode of detecting electrode.
4. the ionic migration spectrometer as described in claim 1 or 3, is characterized in that: every group of pressed on ring being oppositely arranged up and downShape electrode is identical with the voltage that lower ring electrode is applied in.
5. the ionic migration spectrometer as described in claim 1 or 3, is characterized in that: every group of pressed on ring being oppositely arranged up and downShape electrode is identical with lower ring electrode.
6. ionic migration spectrometer as claimed in claim 3, is characterized in that: the gap between adjacent upper ring electrodeIdentical with pressure drop, the gap between adjacent lower ring electrode is identical with pressure drop.
7. the ionic migration spectrometer as described in as arbitrary in claims 1 to 3, is characterized in that: also comprise carrier gas inlet, floatMove gas entrance, the outlet of drift gas and carrier gas outlet, described drift gas entrance is near detecting electrode setting, and described carrier gas entersMouth, the outlet of drift gas and carrier gas outlet are arranged at ion source region.
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| CN106053587B (en) * | 2016-05-23 | 2019-01-11 | 清华大学深圳研究生院 | Spatial discrimination map acquires equipment, fluorography equipment and ionic migration spectrometer |
| CN108226273B (en) * | 2018-01-16 | 2020-06-02 | 清华大学深圳研究生院 | Method for solving problem of frequency spectrum signal attenuation of Fourier transform ion mobility spectrometer |
| CN116381769A (en) * | 2023-04-17 | 2023-07-04 | 中国科学院近代物理研究所 | A beam detection detector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1513114A (en) * | 2001-05-11 | 2004-07-14 | Radial disc type ion mobility spectrometer | |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988005535A2 (en) * | 1987-01-27 | 1988-07-28 | Allied Corporation | Ion mobility detector |
| JP2005174619A (en) * | 2003-12-09 | 2005-06-30 | Hitachi Ltd | Ion mobility spectrometer and ion mobility spectroscopy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1513114A (en) * | 2001-05-11 | 2004-07-14 | Radial disc type ion mobility spectrometer | |
| 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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