CN102856153A - Ion optical off-axis transmission system - Google Patents
Ion optical off-axis transmission system Download PDFInfo
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- CN102856153A CN102856153A CN201210377095XA CN201210377095A CN102856153A CN 102856153 A CN102856153 A CN 102856153A CN 201210377095X A CN201210377095X A CN 201210377095XA CN 201210377095 A CN201210377095 A CN 201210377095A CN 102856153 A CN102856153 A CN 102856153A
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Abstract
The invention belongs to the technical field of mass spectrometry and particularly discloses an ion optical off-axis transmission system which comprises a plurality of four-pole rods and a power supply for providing radio-frequency voltage and direct-current voltage; the four-pole rods are sequentially in step-shaped distribution, four poles are subjected to negative and positive radio-frequency voltage and negative and positive direct-current voltage, and the direct-current voltage of each group of the four-pole rods can be in shaped-shaped distribution as the four-pole rods; the radio-frequency voltage and direct-current voltage of each group of the four-pole rods are adjusted to form an effective step electric field; under the effect of the four-pole electric field, ions perform limited amplitude motion in the transmission direction of the ions, are transmitted to the next level of four-pole rods from the last level of four-pole rods by step turning, and are finally transmitted to a mass analyzer; photons and neutral particles in the ion flow continue performing linear motion without being influenced by the electric field and vanish after being subjected to ion bombardment with the next four-pole rod in the whole transmission process. Selectivity on the ions can be realized by the four-pole rods, corresponding ions can be selected for transmission, and the transmission efficiency and sensitivity of ions can be improved.
Description
Technical field
The invention belongs to the analytical technique of mass spectrum field, be specifically related to a kind of Novel ion optics off-axis transmission system.This system is used for the inductivity coupled plasma mass spectrometry field, can effectively improve ion transmission efficiency and sensitivity.
Background technology
Inductivity coupled plasma mass spectrometry technology (ICP-MS) is a kind of new analysis and testing technology that 20 century 70s develop rapidly, its principle is to utilize inductively coupled plasma that element ion contained in the analytic sample is turned to charged ion, by the ion transfer system these charged ions are introduced in the mass analyzer, by different mass-to-charge ratioes separately, after device amplifies ionic current after testing, provide analysis result by the TT﹠C system processing.Compare with other analytical technology, ICP-MS has that detection limit is low, the range of linearity is wide, can detect simultaneously fast the advantages such as various elements.Along with the expansion of range of application, developed into a kind of analysis and testing technology of routine.
Inductivity coupled plasma mass spectrometry (ICP-MS) mainly is comprised of ICP ion sampling system, interface system, ion optics transmission system, quality analysis detection system.Wherein the ion optics transmission system is the key component of ICP-MS technology, determine that ion is from the interface section of instrument to the transmission the mass analyzer, be the important bridge between inductively coupled plasma ion source and mass analyzer, its performance has also directly determined the performance index of the most criticals such as the sensitivity of ICP-MS and detectability.
In ICP-MS instrument, the ICP plasma that is produced by the torch pipe enters the ion transfer system through sampling spiroid, the intercepting cone of interface section and arrives mass analyzer.The ICP plasma ion is comprised of electronics, ion, photon and neutral particle, and ion beam is accelerated, is focused into to the function of the ion lens in the ion transfer system to ion current exactly.Then transmission arrives mass analyzer, blocks simultaneously photon and neutral particle.Because ion is charged particle, electric field energy makes its deflection, and photon and neutral particle are not subjected to electric field action with straightline propagation, so generally adopt the photon baffle plate or make ion from the mode of axle deflection, ion are separated with photon, neutral particle (non-charged particle).
There is the design of oneself in the ion transfer system that uses in the main product that ICP-MS production firm produces at present, all has characteristic separately.Basically can both realize electric deflection, allow the separating of charged particle and photon and neutral particle.Ion optics transmission system integral body can be divided into three types: photon Flapper type, ion axle type, 90 degree deflection types.
The photon baffle type refers at intercepting cone and the coaxial middle sheet metal of placing of ion lens, the photon, the neutral particle that pass the intercepting cone are stopped by metal baffle, charged cation in the ICP plasma is subject to the guiding of ion lens, converge again after walking around the photon baffle plate, and electronics, repelled by the ion lens electric field and be blocked, neutral particle runs into baffle plate and stops transmission in transmission course, charged cation is focused into the loose angle little ion beam of trying one's best and walks around baffle plate and enter mass analyzer under the effect of ion lens electric field.Although this structural design has avoided photon and the neutral particle in the ICP plasma directly to enter detector and cause signal response, the while has also been caused 80% losses of ions nearly.Thereby cause the poor efficiency of ion transfer and quality to discriminate against.
Ion axle deflection type is that ion current is extracted the lens extraction behind the intercepting cone, electric field action through set of lenses focusing and deflection lens, ion beam is left enter mass analyzer after optical axis passes the aperture that departs from optical axis on the difference plate, utilized neutral particle and photon not still separated with ion along the characteristic that optical axis advances by electric field action, the efficiency of transmission of ion increases, improved sensitivity, but very complicated in whole ion-optic system design, the very difficulty so that the clean and maintenance of the parts such as ion lens becomes, sample matrices can directly be beaten at the ion lens with high pressure and be formed capacity effect simultaneously, and instrument is drifted about easily.
90 degree deflection types turn to 90 degree by parabolical electric field with ion beam, so that photon and neutron background noise that the ICP ion source produces taken out rapidly by vacuum system, thereby guarantee that whole system has very high sensitivity.The focuses of 90 degree corners are not very stable, and speed and reappearance are not high, and the ion-optic system structure of whole instrument is too complicated, so that whole maintenance and dismounting have increased difficulty.
In sum, the ion optics transmission system of ICP-MS has great impact to the analytical performance of instrument, each apparatus manufacture and each analysis and research field are different in the structural design of ion-optic system, all be in order to increase ion transmission efficiency, elimination photon and neutral particle to the impact of instrument, the sensitivity that improves instrument.But in the ion transfer system that is using at present, its structure is complicated, and it is high to clean difficulty, and the problem such as ion transmission efficiency is on the low side.
Summary of the invention
The purpose of this invention is to provide a kind of Novel ion optics off-axis transmission system, in order to effectively realize the deflection path of ion, improve the efficiency of transmission of ion, improve the toward ion-sensitive degree; And it is simple in structure, assembles easily and unpicks and washes.
Novel ion optics off-axis transmission system provided by the invention, this system comprises: quadrupole rod ion transfer device, one group of power supply that is connected to quadrupole rod ion transfer device, power supply is mainly quadrupole rod ion transfer device required radio-frequency voltage and direct voltage is provided, and realizes the transmission of ion focusing and off-axis; Wherein:
Described quadrupole rod ion transfer device is comprised of some level (two) quadrupole rods at least, and quadrupole rod layouts at different levels are successively stairstepping and distribute.
Described quadrupole rod layout is the stairstepping distribution and refers to that whole ion transfer system quadrupole rods at different levels form stairstepping successively, wherein, there is range deviation at rear one-level quadrupole rod Z axis center and previous stage quadrupole rod Z axis center in Y-direction, but this range deviation can not be too large, rear one-level quadrupole rod Z axis center can not with the previous stage quadrupole rod in electrode stem in the same horizontal line, otherwise, from the ion of the previous stage quadrupole rod transmission size according to the ion initial kinetic energy, ion basically all impinges upon on the electrode stem surface of rear one-level quadrupole rod and loses, and ion can't be transferred in the rear one-level quadrupole rods device smoothly.For more effective raising ion transmission efficiency, its one-level ladder height generally can be the maximum rod footpath of 1/4～3/4 electrode stem.So that ion better transmits.
Among the present invention, quadrupole rods at different levels form successively stairstepping and distribute, and the direction of its ladder is unrestricted.Can arrive at ion under the prerequisite of next stage quadrupole rods device, the width of its ladder is unrestricted.
Above-mentioned stairstepping distributes, and mainly is in order effectively to change the transmission path of charged ion, allows wherein charged ion change its ion transfer direction according to the RF voltage and the V voltage that are applied on the quadrupole rod, effectively changes the ion transfer path.Utilize neutral particle and photon not still separated with ion along the characteristic that optical axis advances by electric field action.Through ladder distribution layer by layer, can eliminate fully neutral particle and photon, a last only remaining charged ion passes the ion transfer system, arrives mass analyzer.
Above-mentioned quadrupole rods device is fixed on the ceramic ring by four Metallic rod or four gold-plated insulating material bars and forms.Its processing and assembly precision require lower than the precision of four-electrode quality analyzer, so more are convenient to processing and assembling, also are convenient to dismounting, clean.
Above-mentioned four Metallic rod or four are thoroughly done away with edge material bars, and its cross section can be circular, hyperboloid shape or ellipse, and its length and size are unrestricted.
Among the present invention, described power supply is mainly quadrupole rod ion transfer device required radio-frequency voltage and direct voltage is provided in the ion transfer process, also can provide other waveform signals, or the combination of multi-signal, to realize the functions such as ion focusing and transmission.
Among the present invention, four electrode stems are arranged in each quadrupole rods device, per two symmetry electrode bars partner, and form altogether two pairs, and radio-frequency voltage is added in respectively on the electrode stem of two pairs of symmetries, and its radio-frequency voltage range value is identical, 180 ° of phase phasic differences.The waveform that its radio-frequency voltage produces is unrestricted.
Among the present invention, described radio-frequency voltage and direct voltage are applied on four electrode stems of quadrupole rod, be apply respectively on the electrode stem of two pairs of symmetries of quadrupole rod+the RF radio-frequency voltage and-the RF radio-frequency voltage, wherein, adding+one of them electrode stem of RF radio-frequency voltage adds+the V direct voltage, adding+the another one electrode stem of RF radio-frequency voltage adds-the V direct voltage, add-do not add any direct voltage on two electrode stems of RF radio-frequency voltage, thereby the inner quadripolar electric field that forms of quadrupole rod, ion is vertically done the amplitude transmitting moving of rule at quadrupole rod; Wherein, the dc voltage value that is added on the quadrupole rods at different levels also is the ladder distribution step by step, and the differential adjustable extent of its voltage is 0.5 ~ 10V.Radio-frequency voltage and dc voltage value form effective electrical potential difference, can change the transmission path direction of ion.
For example, radio-frequency voltage+RF and direct voltage+V are applied on the Y-direction of quadrupole rod on the electrode stem, and radio-frequency voltage+RF and direct voltage-V are applied on the Y-direction on another root electrode stem; Radio-frequency voltage-RF is applied on the directions X of quadrupole rod on two symmetry electrode bars.Change radio-frequency voltage RF value and direct voltage V value, ion enters quadrupole rod Z direction when advancing, and the motion of ion in quadrupole rod is the resultant motion that X and Y-direction are vibrated.Ion is done limited amplitude motion around Z-direction, changes the value of RF and V, by regulating the inside quadrupole field of quadrupole rod, can effectively improve ion by the efficiency of transmission of quadrupole rod.Ion arrives second level quadrupole rod by the transmission of first order quadrupole rod.For the quadrupole rod of back, apply the method for magnitude of voltage at electrode stem with first order quadrupole rod.Wherein, the dc voltage value that is added on the quadrupole rods at different levels also is the ladder distribution step by step, forms an effective electromotive force ladder, to make things convenient for ion transfer.
Quadrupole rods device of the present invention can selectivity be selected ion transfer.The unrestricted selection of the kind of its ion.
The present invention has ion guides transmission and the selective function of confrontation measurer according to quadrupole rod, allow the mass ion of target zone pass through, change the transmission path of its ion by quadripolar electric field, apply single direct voltage than simple traditional ion transfer system, can increase ion transmission efficiency, eliminate the impact of photon and neutral ion, the sensitivity that can improve whole instrument.As an ion optics transmission system, the required precision of its quadrupole rod is low, is easy to processing and assembling, is convenient to unpick and wash.Can also be applicable to the ion optics transmission system on other mass spectrometers.
Ion optics off-axis transmission system of the present invention can be used in any ion optics transmission system device of mass spectral analysis field.
Description of drawings
Fig. 1 is ion optics off-axis transmission system structural representation.
Fig. 2 is ion optics off-axis transmission system quadrupole rod end face structure generalized section.
Fig. 3 is ion optics off-axis transmission system theoretical modeling result of calculation figure.
Fig. 4 is ion optics off-axis transmission system overall applicability structural representation.
Embodiment
Shown in Fig. 1 ~ 3, the present invention is a kind of ion optics transmission system for the inductively coupled plasma mass spectrum.As shown in Figure 1, its structure mainly is to be the ladder distribution by two or more quadrupole rods to assemble.Wherein, the center of second level quadrupole rod 102 is lower than the center of first order quadrupole rod 101, the center of third level quadrupole rod 103 is lower than the center of second level quadrupole rod 102, the distribution of the quadrupole rod of back the like, be the ladder that descends step by step backward and distribute.
Ion transfer system quadrupole rod applies voltage as shown in Figure 2, apply radio-frequency voltage+RF and direct voltage+V at the first electrode stem 201, apply radio-frequency voltage+RF and direct voltage-V at the second electrode stem 202, on third electrode bar 203 and the 4th electrode stem 204, only apply radio-frequency voltage-RF.And the direct voltage that applies on first order quadrupole rod 101, second level quadrupole rod 102, the third level quadrupole rod 103 also is ladder and distributes, and forms the ladder electric field, makes things convenient for ion transfer.Wherein by regulating radio-frequency voltage RF and direct voltage V, under the effect of quadripolar electric field, ion is transferred to second level quadrupole rod 102 from first order quadrupole rod 101, because admixing photon and neutral particle in the ion, its photon and neutral particle are not subjected to the effect of electric field, make rectilinear motion and can't change the path that curves, all be contained on the electrode of second level quadrupole rod 102 and disappear, and ion is the quadripolar electric field effect that is subject to second level quadrupole rod 102, changed the transmission path of ion, curved smoothly and do the ion amplitude motion in the second level quadrupole rod 102; Same principle, ion are transferred to third level quadrupole rod 103 after by second level quadrupole rod 102 ..., arrive at last mass analyzer.
According to design of the present invention, by theoretical modeling Software for Design computation model.Its analog theory result of calculation as shown in Figure 3.First order quadrupole rod 301 in theoretical computational process, second level quadrupole rod 302, third level quadrupole rod 303 apply the voltage method that applies that voltage describes in according to embodiment.Ion transfer path in the theoretical modeling is basically consistent according to the path of the imagination in the theory.Ion is after passing through first order quadrupole rod 101, and under the effect of second level quadrupole rod 102 electric fields, ion has changed the linear transmission path, curves second level quadrupole rod 102, transmission in second level quadrupole rod 102.Same principle, ion transfer are in third level quadrupole rod 103, and the transmission path of ion is basically according to the path transmission of imagining.According to the result that theoretical modeling calculates, the efficient of ion transfer can reach more than 90%, has reduced ion loss in transmission course, realizes efficient ion transfer; In addition, in the ion transfer process, can realize the selectivity ion transfer, thereby improve ion transfer sensitivity.
Ion optics off-axis transmission system of the present invention can be applicable to the mass of ion analytical system, and its structure as shown in Figure 4.Comprise: the ion source, ion optics off-axis transmission system, mass of ion analyzer, the detector that connect successively obtain mass spectrogram at last.
Claims (6)
1. ion optics off-axis transmission system, it is characterized in that system comprises: quadrupole rod ion transfer device, one group of power supply that is connected to quadrupole rod ion transfer device, this power supply provides required radio-frequency voltage and direct voltage for quadrupole rod ion transfer device, realizes the transmission of ion focusing and off-axis; Wherein:
Described quadrupole rod ion transfer device is comprised of some grades of quadrupole rods, and quadrupole rod layouts at different levels are successively stairstepping and distribute;
Wherein, it is the one-level ladder height that there is range deviation at rear one-level quadrupole rod Z axis center and previous stage quadrupole rod Z axis center in Y-direction, and the one-level ladder height is the maximum rod footpath of 1/4～3/4 electrode stem.
2. ion optics off-axis transmission system according to claim 1 is characterized in that described quadrupole rod is fixed on the ceramic ring by four Metallic rod or four gold-plated insulating material bars to form.
3. ion optics off-axis transmission system according to claim 2 is characterized in that described four Metallic rod or four eradication edge material bars, and its cross section is circle, hyperboloid shape or ellipse.
4. ion optics off-axis transmission system according to claim 1, it is characterized in that four electrode stems are arranged in each quadrupole rod, per two symmetry electrode bars partner, totally two pairs, radio-frequency voltage is added in respectively on the electrode stem of two pairs of symmetries, its radio-frequency voltage range value is identical, 180 ° of phase phasic differences.
5. ion optics off-axis transmission system according to claim 4, it is characterized in that applying respectively on the electrode stem of two pairs of symmetries in the described quadrupole rod+the RF radio-frequency voltage and-the RF radio-frequency voltage, applying+one of them electrode stem of RF radio-frequency voltage applies+the V direct voltage, applying+the another one electrode stem of RF radio-frequency voltage applies-the V direct voltage, apply-do not apply any direct voltage on two electrode stems of RF radio-frequency voltage, thereby at the inner quadripolar electric field that forms of quadrupole rod; And the dc voltage value that is applied on the quadrupole rods at different levels also is the ladder distribution step by step, and every step voltage is differential to be 0.5 ~ 10V, forms an effective electromotive force ladder.
6. ion optics off-axis transmission system according to claim 5, it is characterized in that described radio-frequency voltage+RF and direct voltage+V are applied on the Y-direction of quadrupole rod on the electrode stem, radio-frequency voltage+RF and direct voltage-V are applied on the Y-direction on another root electrode stem; Radio-frequency voltage-RF is applied on the directions X of quadrupole rod on two symmetry electrode bars; Change radio-frequency voltage RF value and direct voltage V value, ion enters quadrupole rod Z direction when advancing, and the motion of ion in quadrupole rod is the resultant motion that X and Y-direction are vibrated.
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| CN201210377095XA CN102856153A (en) | 2012-10-08 | 2012-10-08 | Ion optical off-axis transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104851773A (en) * | 2015-05-26 | 2015-08-19 | 合肥美亚光电技术股份有限公司 | Ion deflection transmission apparatus and mass spectrometer using same |
| CN108091537A (en) * | 2016-11-21 | 2018-05-29 | 中国科学院大连化学物理研究所 | A kind of ladder Field ion mobility pipe |
| CN109841489A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | A kind of device for reducing radiofrequency quadrupole transmission quality and discriminating against |
| CN113410119A (en) * | 2021-05-07 | 2021-09-17 | 广东省科学院测试分析研究所(中国广州分析测试中心) | Plasma mass spectrum ion focusing deflection sample introduction interface and working mode |
| CN113841220A (en) * | 2019-05-21 | 2021-12-24 | 塞莫费雪科学（不来梅）有限公司 | Ion guide with reduced nodal effects |
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| US6730904B1 (en) * | 2003-04-30 | 2004-05-04 | Varian, Inc. | Asymmetric-field ion guiding devices |
| CN1779457A (en) * | 2005-10-19 | 2006-05-31 | 广州禾信自动化系统有限公司 | Gas-phase molecular ion reactor based on radio-frequency quard-polar rod, its realization and use |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104851773A (en) * | 2015-05-26 | 2015-08-19 | 合肥美亚光电技术股份有限公司 | Ion deflection transmission apparatus and mass spectrometer using same |
| CN108091537A (en) * | 2016-11-21 | 2018-05-29 | 中国科学院大连化学物理研究所 | A kind of ladder Field ion mobility pipe |
| CN109841489A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | A kind of device for reducing radiofrequency quadrupole transmission quality and discriminating against |
| CN113841220A (en) * | 2019-05-21 | 2021-12-24 | 塞莫费雪科学（不来梅）有限公司 | Ion guide with reduced nodal effects |
| CN113841220B (en) * | 2019-05-21 | 2024-05-14 | 塞莫费雪科学（不来梅）有限公司 | Ion guide with reduced node effect |
| CN113410119A (en) * | 2021-05-07 | 2021-09-17 | 广东省科学院测试分析研究所(中国广州分析测试中心) | Plasma mass spectrum ion focusing deflection sample introduction interface and working mode |
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Application publication date: 20130102 |