A three-grid ion gate with switchable positive and negative ion implantation and its application
A technology of positive and negative ions and ion gates, which is applied in the direction of electron/ion optical devices, parts of particle separator tubes, particle separation tubes, etc. It can solve problems such as poor stability, complex circuits, and inability to realize forward or reverse pulses. , to achieve the effect of convenient processing, simple structure and easy mass production
Active Publication Date: 2021-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0003] Traditional TP gate control is achieved by applying a forward or reverse pulse voltage on the grid of one of the ion gates; however, to achieve positive and negative ion detection modes, a single forward or reverse pulse cannot be achieved
The solution is realized by designing compatible positive and negative pulses. The single defect is that the circuit is complex and the stability is poor.
In addition, this pulse control method leads to an increase in the size of the instrument
Not conducive to miniaturization and portability
Method used
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Embodiment 1
[0031] The tri-grid ion gate and control circuit are used in conjunction with ion mobility spectrometry for the detection of positive and negative ions. figure 2 shown. Highly sensitive trace determination of TATP and TNT can be achieved.
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Abstract
The invention discloses an ion control technology under atmospheric pressure, in particular to a three-grid ion gate and a control circuit for quickly switching positive and negative ion injection, including three coaxial and parallel metal mesh electrodes. The grid electrode in the middle is a control electrode, which is connected with the isolated pulse power supply, and the ion injection is realized by regulating the on-off of the isolated pulse power supply. The invention can realize switching injection of positive and negative ions, can realize quasi-simultaneous measurement of positive and negative ions when used in conjunction with a single ion transfer tube, is beneficial to reduce volume and power consumption, and reduce cost to facilitate processing and industrialization promotion.
Description
technical field [0001] The invention relates to the atmospheric pressure ion manipulation technology, in particular to a three-grid ion gate for rapidly switching positive and negative ion injection, including three coaxial and parallel metal mesh electrodes. The grid electrode in the middle is a control electrode, which is connected with the isolated pulse power supply, and the ion injection is realized by regulating the on-off of the isolated pulse power supply. The invention can realize the switching injection of positive and negative ions, avoid the recombination of positive and negative ions in the process of simultaneous transmission of positive and negative ions, thereby greatly improving detection sensitivity. The invention can be used for positive and negative switching ion mobility spectrometry, realizes the positive and negative ion determination of a single migration tube under the condition of single sample injection, and is convenient for processing and industria...
Claims
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IPC IPC(8): H01J49/06
CPCH01J49/061
Inventor 王卫国李海洋仓怀文李京华李东明
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI