CN108565202B - Isotope-resolved ion velocity imager and control method thereof - Google Patents

Isotope-resolved ion velocity imager and control method thereof Download PDF

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CN108565202B
CN108565202B CN201810199443.6A CN201810199443A CN108565202B CN 108565202 B CN108565202 B CN 108565202B CN 201810199443 A CN201810199443 A CN 201810199443A CN 108565202 B CN108565202 B CN 108565202B
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charged
electrode plate
charged electrode
flight
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CN108565202A (en
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刘玉柱
章炎麟
常运华
颜逸辉
尹文怡
祝若松
钱晓陆
张启航
周冯斌
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Nanjing University of Information Science and Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/26—Mass spectrometers or separator tubes
    • H01J49/34—Dynamic spectrometers
    • H01J49/40—Time-of-flight spectrometers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/0004—Imaging particle spectrometry
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/0027—Methods for using particle spectrometers
    • H01J49/0031—Step by step routines describing the use of the apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

The invention discloses an isotope resolution ion velocity imager and a control method thereof, wherein a first charged plate electrode, a second charged plate electrode, a third charged plate electrode, a fourth charged plate electrode and a fifth charged plate electrode are sequentially arranged along the horizontal direction and are all charged plate electrodes with round holes in the middle, a gas conduit penetrates through one end part of a shell and is fixed in the shell, a gas sample injection pulse valve is arranged at one end part of the gas conduit, a laser beam is arranged between the first charged plate electrode and the second charged plate electrode and corresponds to the position of the gas conduit, a first flight shielding pipe and a second flight shielding pipe are arranged along the horizontal direction, a deflection plate electrode is arranged between the first flight shielding pipe and the second flight shielding pipe, grid meshes are respectively arranged at the ends, close to the first flight shielding pipe and the second flight shielding pipe and the deflection plate electrode, and a detector is arranged at the other end part of the shell. The invention can realize high-resolution isotope distinguishing to carry out ion velocity imaging, and can distinguish isotope ions with very close mass numbers.

Description

Isotope-resolved ion velocity imager and control method thereof
Technical Field
The invention relates to an ion velocity imager and a control method thereof, in particular to an isotope-resolved ion velocity imager and a control method thereof.
Background
The current ion velocity imager is designed in 1997 by the netherlands scientist eppin and Parker, and by designing three polar plates with round holes, forming an ion lens under a certain optimized voltage configuration, focusing charged particles with the same velocity but at different positions, and collecting the charged particles by a Micro-channel Plate & ph pump Screen (Micro-channel Plate & phosphor Screen) detector at the rear end of a flight tube, as shown in fig. 5 (a), wherein P1 is a repulsive-stage polar Plate, P2 is an accelerating-stage polar Plate, and P3 is a grounding-stage polar Plate. Charged particles at different positions are focused on one point of the detector under the action of the ion lens, which greatly improves the resolution of ion velocity imaging. After applying a suitable voltage to the perforated disk, an ion lens is formed, as shown in fig. 5 (b).
However, current ion velocity imagers based on tripolar plate designs, as well as later developed multipole plate ion velocity imagers, are not capable of resolving imaging of isotopic parent ions or fragment ions. While the evolving "mass gate" technique allows resolution imaging of charged ion fragments of very large mass differences, it is difficult to image isotope fragments of very small mass differences, such as 12C, 13C ions, with high resolution, since the "mass gate" technique is based on controlling the detector voltage to deactivate the detector, and when the ion of interest arrives, trying to "momentarily" put the detector in high voltage to operate it, thereby selectively detecting certain mass ions of interest. However, this voltage change is difficult to accomplish by "transients", so that it is difficult in the prior art to distinguish between ions of very close mass numbers, such as the same as the pixel ions 12C, 13C; meanwhile, the voltage of the detector is instantaneously reduced to 0 from high voltage, so that a discharge phenomenon can be generated, the detector can be possibly damaged, the imaging effect is influenced, and an erroneous experimental result is caused; while it is well known to those skilled in the art of ion velocity imaging that MCP & PS detectors are very expensive, long term operation can reduce detector lifetime.
Disclosure of Invention
The invention aims to provide an isotope-resolved ion velocity imager and a control method thereof, which are used for distinguishing isotope ions with very close mass numbers.
In order to solve the technical problems, the invention adopts the following technical scheme:
an isotope resolved ion velocity imager, characterized by: the detector comprises a shell, a first charged plate, a second charged plate, a third charged plate, a fourth charged plate, a fifth charged plate, a first flight shielding tube, a deflection plate, a second flight shielding tube, a detector, a gas conduit, a gas sampling pulse valve and a laser beam, wherein the first charged plate, the second charged plate, the third charged plate, the fourth charged plate and the fifth charged plate are sequentially arranged along the horizontal direction and are all charged plates with round holes in the middle, the gas conduit passes through one end of the shell and is fixed in the shell, the gas sampling pulse valve is arranged at one end of the gas conduit, the laser beam is arranged between the first charged plate and the second charged plate and corresponds to the position of the gas conduit, the first flight shielding tube and the second flight shielding tube are arranged along the horizontal direction, the deflection plate is arranged between the first flight shielding tube and the second flight shielding tube, grid nets are respectively arranged at one ends, close to the deflection plate, and the detector is arranged at the other end of the shell.
Further, the length of the shell is 1417mm, the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are round electrode plates with round holes, the thicknesses of the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 2mm, the outer diameters of the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 140mm, the inner diameters of the first charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 10mm, 20mm, 30mm, 40mm and 25mm respectively, the distances among the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 38mm, and the distances between the first charged electrode plate and the end of the shell are 100mm.
Further, the first flight shielding pipe and the second flight shielding pipe are mu metal round pipes, the inner diameter is 82mm, the outer diameter is 88mm, and the thickness is 3mm.
Further, the deflection polar plate is composed of four polar plates, an upper polar plate and a lower polar plate are arranged up and down, a left polar plate and a right polar plate are arranged left and right, the four polar plates are arc polar plates, the four polar plates form a circular tube shape, the inner diameter of the formed circular tube is 82mm, the outer diameter is 88mm, and the thickness is 3mm.
Further, the voltages of the first charged plate, the second charged plate, the third charged plate, the fourth charged plate and the fifth charged plate are 3000V, 2080V, 200V, 100V and 0V, respectively.
Further, the upper polar plate voltage is 400V, the lower polar plate voltage is-400V, the left polar plate and the right polar plate are grounded, and the first flying shielding tube and the second flying shielding tube are also grounded.
A control method of an isotope-resolved ion velocity imager, characterized by:
defining the isotope with larger mass as A and the isotope with smaller mass as B;
in the experiment, the influence of B is eliminated if the speed image of the ion A needs to be detected, the mass of B is smaller than that of A, B flies to the grid before A, after B just flies out of the grid of the first flight shielding pipe, the deflection polar plate forms a pulse deflection field, so that the ion B deflects and is not detected, when the ion A flies out of the grid of the first flight shielding pipe, the pulse deflection field of the deflection polar plate is evacuated, and the ion A is imaged according to the original path;
in the experiment, the influence of A is eliminated when the speed image of B ions needs to be detected, the mass of A is greater than that of B, B flies to the grid before A, B flies to the grid of the second flight shielding pipe, and before A does not fly to the grid of the second flight shielding pipe, the deflection polar plate forms a pulse deflection field, so that the ion A deflects and is not detected, and B ions are imaged according to the original path.
Compared with the prior art, the invention has the following advantages and effects: the invention can realize high-resolution isotope distinguishing ion velocity imaging, can realize measuring velocity images of charged ions with different masses without changing the working voltage of the detector in the measuring process, and can distinguish isotope ions with very close mass numbers.
Drawings
Fig. 1 is a schematic diagram of an isotope resolved ion velocity imager of the present invention.
Fig. 2 is a diagram of the deflection plate arrangement and electric field distribution of the present invention.
Fig. 3 is a timing diagram of the operation of the isotope resolution ion velocity imager of the present invention.
Fig. 4 is a graph of the distribution of potential energy and effect of the isotope resolved ion velocity imager of the present invention.
Fig. 5 is a schematic diagram of a prior art ion velocity imager.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
As shown in fig. 1, the isotope-resolved ion velocity imager of the present invention comprises a housing, a first charged plate E1, a second charged plate E2, a third charged plate E3, a fourth charged plate E4, a fifth charged plate E5, a first flying shield tube E6, a deflection plate, a second flying shield tube E11, a detector D1, a gas conduit T1, a gas sample injection pulse valve V1, and a laser beam L1, wherein the first charged plate E1, the second charged plate E2, the third charged plate E3, the fourth charged plate E4, and the fifth charged plate E5 are sequentially arranged in the horizontal direction and are all charged plates with round holes in the middle, the gas conduit T1 passes through one end of the housing and is fixed in the housing, the gas sample injection pulse valve V1 is arranged at one end of the gas conduit T1, the laser beam L1 is arranged between the first charged plate E1 and the second charged plate E2 and corresponds to the position of the gas conduit T1, the first flying shield tube E6 and the second flying shield tube E11 are arranged in the horizontal direction, the deflection plate is arranged between the first flying shield tube E6 and the second flying shield tube E1 and the second flying shield tube E11 is arranged near the other end of the first flying shield tube E1 and the second flying shield tube E1.
The length of the shell is 1417mm, the first charged electrode plate E1, the second charged electrode plate E2, the third charged electrode plate E3, the fourth charged electrode plate E4 and the fifth charged electrode plate E5 are round electrode plates with round holes, the thicknesses of the first charged electrode plate E1, the second charged electrode plate E2, the third charged electrode plate E3, the fourth charged electrode plate E4 and the fifth charged electrode plate E5 are 2mm, the outer diameters of the first charged electrode plate E1, the second charged electrode plate E2, the third charged electrode plate E3, the fourth charged electrode plate E4 and the fifth charged electrode plate E5 are 140mm, the inner diameters of the first charged electrode plate E1, the second charged electrode plate E2, the third charged electrode plate E3, the fourth charged electrode plate E4 and the fifth charged electrode plate E5 are 10mm, 20mm, 30mm, 40mm and 25mm respectively, the distances between the first charged electrode plate E1, the second charged electrode plate E2, the third charged electrode plate E3, the fourth charged electrode plate E4 and the fifth charged electrode plate E5 are 38mm, and the distance between the first charged electrode plate E1 and the end of the shell is 100mm.
The first flying shield tube E6 and the second flying shield tube E11 are mu metal round tubes, the inner diameter is 82mm, the outer diameter is 88mm, and the thickness is 3mm. As shown in fig. 2, the deflection polar plate is composed of four polar plates, an upper polar plate E7 and a lower polar plate E8 are arranged up and down, a left polar plate E9 and a right polar plate E10 are arranged left and right, the four polar plates are arc polar plates, the four polar plates form a circular tube shape, the inner diameter of the circular tube formed by the four polar plates is 82mm, the outer diameter is 88mm, and the thickness is 3mm.
The voltages of the first charged plate E1, the second charged plate E2, the third charged plate E3, the fourth charged plate E4 and the fifth charged plate E5 are 3000V, 2080V, 200V, 100V and 0V respectively. The upper polar plate E7 is 400V in voltage, the lower polar plate E8 is-400V in voltage, the left polar plate and the right polar plate are grounded, and the first flying shielding tube E6 and the second flying shielding tube E11 are also grounded. As shown in FIG. 4, V1 is the working sequence of the pulse valve, L1 is the laser working sequence, and the deflection electric field E7&E8 is the deflection electric field operation timing, all three of which are precisely controlled by DG 535. At the above voltage settings, as shown in FIG. 4, to analyze its feasibility, we simulated it using International SIMION software, assuming that the test was to be performed 12 Velocity image of C ion to exclude isotopes 13 The effect of C is that, 12 the C ion imaging results are shown in FIG. 4 (C), which shows the same kinetic energy (0.7 eV) over a range of 12mm of ion source distribution 12 C ions are focused on the detector to realize imaging; while 13 The C ions are successfully deflected by the pulsed electric field without interference,the pulse potential distribution is shown in fig. 4 (d), and the deflection effect is shown in fig. 4 (e).
A control method of an isotope-resolved ion velocity imager,
defining the isotope with larger mass as A and the isotope with smaller mass as B;
in the experiment, the influence of B is eliminated if the speed image of the ion A needs to be detected, the mass of B is smaller than that of A, B flies to the grid before A, after B just flies out of the grid of the first flight shielding pipe, the deflection polar plate forms a pulse deflection field, so that the ion B deflects and is not detected, when the ion A flies out of the grid of the first flight shielding pipe, the pulse deflection field of the deflection polar plate is evacuated, and the ion A is imaged according to the original path;
in the experiment, the influence of A is eliminated when the speed image of B ions needs to be detected, the mass of A is greater than that of B, B flies to the grid before A, B flies to the grid of the second flight shielding pipe, and before A does not fly to the grid of the second flight shielding pipe, the deflection polar plate forms a pulse deflection field, so that the ion A deflects and is not detected, and B ions are imaged according to the original path.
How to image isotopes in particular, here 12 C and C 13 C is illustrated as an example if the test is to be performed 13 Velocity image of C ion to exclude isotopes 12 Influence of C. The operation will be as follows: 12 the mass of C is less than 13 C, will be prior to 13 C, at 12 C just fly out E 6 After flying the grid of the shielding tube, E7 and E8 form a pulse deflection field to make 12 The C ion deflects without being detected. Since the E6 flight shielding tube is provided with the grounding grid, the E7 and E8 form a pulse deflection field which does not generate ions with points which do not fly out of the grid temporarily 13 C has an effect on, and when the ion is dotted 13 After C flies out of the grid on the right side of E6, the E7 and E8 pulsed deflection fields have been evacuated, 13 c can be imaged completely according to the original path 12 C will not be opposite due to being deflected 13 C causes any interference.
Otherwise if the test is to be performed 12 C ionVelocity image of the seed, excluding isotopes 13 Influence of C. The operation will be as follows: 13 the mass of C is greater than 12 C, will be after 12 C, at 12 C flies into the grid of the E11 flying shielding pipe 13 C is not flown into the grid of the E11 flying shielding tube, and E7 and E8 form a pulse deflection field to make 13 The C ion deflects without being detected. Since the E11 flight shield tube is provided with the grounding grid, the E7 and E8 form a pulse deflection field which does not generate ions with points which are flown into the E11 grid 12 The effect of C is that, 12 c can be imaged completely according to the original path 13 C will not be opposite due to being deflected 12 C causes any interference.
The foregoing description of the invention is merely exemplary of the invention. Various modifications or additions to the described embodiments may be made by those skilled in the art to which the invention pertains or in a similar manner, without departing from the spirit of the invention or beyond the scope of the invention as defined in the appended claims.

Claims (5)

1. An isotope resolved ion velocity imager, characterized by: the detector comprises a shell, a first charged plate, a second charged plate, a third charged plate, a fourth charged plate, a fifth charged plate, a first flight shielding tube, a deflection plate, a second flight shielding tube, a detector, a gas conduit, a gas sampling pulse valve and a laser beam, wherein the first charged plate, the second charged plate, the third charged plate, the fourth charged plate and the fifth charged plate are sequentially arranged along the horizontal direction and are all charged plates with round holes in the middle, the gas conduit passes through one end of the shell and is fixed in the shell, the gas sampling pulse valve is arranged at one end of the gas conduit, the laser beam is arranged between the first charged plate and the second charged plate and corresponds to the position of the gas conduit, the first flight shielding tube and the second flight shielding tube are arranged along the horizontal direction, the deflection plate is arranged between the first flight shielding tube and the second flight shielding tube, grid meshes are respectively arranged at one ends of the first flight shielding tube and the second flight shielding tube, which are close to the deflection plate, and the detector is arranged at the other end of the shell;
the length of the shell is 1417mm, the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are round electrode plates with round holes, the thicknesses of the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 2mm, the outer diameters of the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 140mm, the inner diameters of the first charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 10mm, 20mm, 30mm, 40mm and 25mm respectively, the distances between the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 38mm, and the distances between the first charged electrode plate and the end of the shell are 100mm;
the deflection polar plate is composed of four polar plates, an upper polar plate and a lower polar plate are arranged up and down, a left polar plate and a right polar plate are arranged left and right, the four polar plates are arc polar plates, the four polar plates form a circular tube shape, the inner diameter of the formed circular tube is 82mm, the outer diameter is 88mm, and the thickness is 3mm.
2. The isotope resolved ion velocity imager as defined in claim 1, wherein: the first flight shielding pipe and the second flight shielding pipe are mu metal round pipes, the inner diameter is 82mm, the outer diameter is 88mm, and the thickness is 3mm.
3. The isotope resolved ion velocity imager as defined in claim 1, wherein: the voltages of the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate and the fifth charged electrode plate are 3000V, 2080V, 200V, 100V and 0V respectively.
4. The isotope resolved ion velocity imager as defined in claim 1, wherein: the upper polar plate voltage is 400V, the lower polar plate voltage is-400V, the left polar plate and the right polar plate are grounded, and the first flying shielding tube and the second flying shielding tube are also grounded.
5. A method of controlling an isotope resolved ion velocity imager in accordance with any one of claims 1-4, wherein:
defining the isotope with larger mass as A and the isotope with smaller mass as B;
in the experiment, the influence of B is eliminated if the speed image of the ion A needs to be detected, the mass of B is smaller than that of A, B flies to the grid before A, after B just flies out of the grid of the first flight shielding pipe, the deflection polar plate forms a pulse deflection field, so that the ion B deflects and is not detected, when the ion A flies out of the grid of the first flight shielding pipe, the pulse deflection field of the deflection polar plate is evacuated, and the ion A is imaged according to the original path;
in the experiment, the influence of A is eliminated when the speed image of B ions needs to be detected, the mass of A is greater than that of B, B flies to the grid before A, B flies to the grid of the second flight shielding pipe, and before A does not fly to the grid of the second flight shielding pipe, the deflection polar plate forms a pulse deflection field, so that the ion A deflects and is not detected, and B ions are imaged according to the original path.
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GB201011862D0 (en) * 2010-07-14 2010-09-01 Thermo Fisher Scient Bremen Ion detection arrangement
GB201522533D0 (en) * 2015-12-21 2016-02-03 Nu Instr Ltd Mass spectrometers
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CN106852079A (en) * 2017-02-28 2017-06-13 西安交通大学 A kind of ion wind dedusting ventilator cabinet
CN207993800U (en) * 2018-03-12 2018-10-19 南京信息工程大学 The Velocity map ion imaging instrument that isotope is differentiated

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US4107524A (en) * 1975-12-04 1978-08-15 Book David L High atomic weight isotope separator
JPH11301014A (en) * 1998-04-20 1999-11-02 Ricoh Co Ltd Method and device for image forming
JP2000123784A (en) * 1998-10-15 2000-04-28 Hitachi Ltd Quadrupole mass spectrometer
GB0326517D0 (en) * 2002-11-22 2003-12-17 Jeol Ltd Orthogonal acceleration tim-of-flight mass spectrometer
GB201011862D0 (en) * 2010-07-14 2010-09-01 Thermo Fisher Scient Bremen Ion detection arrangement
GB201522533D0 (en) * 2015-12-21 2016-02-03 Nu Instr Ltd Mass spectrometers
CN105789021A (en) * 2016-02-05 2016-07-20 南京信息工程大学 Ion lens device of bipolar electron optical ion imager
CN206148392U (en) * 2016-10-18 2017-05-03 中国原子能科学研究院 Ion source is emittance appearance probe for beam diagnostics
CN106852079A (en) * 2017-02-28 2017-06-13 西安交通大学 A kind of ion wind dedusting ventilator cabinet
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