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Compact ion reflector

A reflector, compact technology, applied in the field of time-of-flight mass spectrometry instruments, can solve the problems of flexibility limitation, difficult processing of ion reflectors, and increased cost, and achieves high universality, easy industrial production, and lightweight quality. Effect

Inactive Publication Date: 2015-03-04
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is precisely because of the above reasons that the processing of ion reflectors is more difficult, and the cost is correspondingly increased, and its flexibility is also limited.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] Schematic diagram of electric field simulation

[0037] This example is intended to illustrate that a uniform electric field can be generated through the example provided by the present invention, and its machining accuracy is mainly reflected in the machining of the insulating cylinder. The difficulty of processing the metal cylinder is far less than the processing of a series of thin electrode rings. At the same time, it is easier to install and fasten by winding the metal wire on it. The present invention adopts front electrode thick 2 millimeters, inner warp 50 millimeters, outer diameter 75 millimeters. Metal electrode wire ring 18 rings, metal wire diameter 1 mm, wound on the surface of an insulating cylinder processed by polyether ether ketone, the surface of the insulating cylinder is grooved to fix the metal electrode wire ring, its outer diameter is 50 mm, and its inner diameter is 45 mm . The final electrode is 2 mm thick and has an outer diameter of 50 mm...

Embodiment 2

[0039] Simulation diagram of ion flight trajectory through ion reflector

[0040] The purpose of this embodiment is to show that the ions pass through the flight trajectory simulation diagram of the specific embodiment of the present invention, such as image 3 shown. The experimental processing conditions adopted in this embodiment are consistent with those in Example 1. The front electrode is grounded, and the voltage applied from the first ring wire electrode to the last electrode is successively increased from 100 volts to 1900 volts. The ions are carbon-12 cations with a kinetic energy of 1200 electron volts and a certain distribution in the direction of the flight path. It can be clearly seen from the figure that ions can be effectively deflected in the direction of velocity by the ion reflector. By observing the position of counter ions, it is also found that after passing through the ion reflector, the distribution gap of its flight axis is significantly reduced, whic...

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Abstract

Disclosed in the invention is a compact ion reflector comprising a front electrode, a metal wire electrode ring, a tail electrode. The front electrode is an annular grid electrode plate and is used for shielding an electric field interference on an ion in a field-free flying zone by the voltage exerted by the reflector. The metal wire electrode ring is formed by a series of 3 to 100 loops of metal wires that are independent of each other and are wound around the outer side of an insulated cylinder and is used for generating a uniform electric field enabling the ion to make the reverse motion. The tail electrode is a circular metal plate electrode. The front electrode and the tail electrode are installed at the insulated cylinder. Different electric field characteristics are established in the reflector by adjusting voltages applied on the metal wire electrode ring and the tail electrode, the spacing of the metal wire electrode ring, and the inner diameter of the insulated cylinder. Therefore, the ion reflector that can be applied to different conditions is provided.

Description

Technical field: [0001] The invention relates to the field of time-of-flight mass spectrometry instruments, and more particularly, the invention relates to a compact ion reflector that can be used in time-of-flight mass spectrometers. Background technique: [0002] As an important branch of mass spectrometry, time-of-flight mass spectrometry is playing an increasingly important role in modern physics, chemistry and biology. Its working principle is relatively simple. First, the sample to be analyzed is ionized. The ionization method can be electron bombardment, chemical ionization, laser ionization and other means. Then, the ionized sample is accelerated by an electric field into the mass analyzer, where the separation of different samples to be analyzed is realized. Finally, the ion detector determines the specific composition of the sample to be analyzed according to the time when different ions arrive at the detector, thereby realizing high-precision analysis of the samp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/40
CPCH01J49/405
Inventor 王利刘本康
Owner DALIAN NATIONALITIES UNIVERSITY
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