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Transient drift field method in use for drift tube of ionic mobility spectrometer

A technology of ion mobility and drift electric field, which is applied in the field of detection, can solve the problems that circuits are difficult to integrate and use, and achieve the effect of integration

Inactive Publication Date: 2007-12-26
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In the schematic diagram of the ion mobility spectrometer (IMS) shown in Figure 1, there are multiple drift electrodes in the ion drift region, and the ion mobility spectrometer (IMS) instrument of the traditional structure is to add a constant voltage to each drift electrode, Establish a drift electric field with a required strength of about 200V / cm in the entire space of the drift region, which requires the use of a high-voltage power supply of the order of 1000V, and the circuit is not easy to integrate, and it is even more difficult to use relatively mature IC technology to achieve

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  • Transient drift field method in use for drift tube of ionic mobility spectrometer
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  • Transient drift field method in use for drift tube of ionic mobility spectrometer

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[0024] The principle of the transient electric field method used in the ion mobility spectrometer drift tube of the present invention is as follows:

[0025] When the charged ions are accelerated and moved forward under the action of the drift electric field, they will collide with the neutral drift gas molecules and decelerate, and then the ions will continue to be accelerated by the electric field, and then decelerate after collision, and so on. The microscopic motion of the ions is shown as the ion obtains an average drift velocity v on the macroscopic scale d , in the case of a weak electric field, it is proportional to the electric field strength E: v d =KE, the proportional constant K in the formula is the mobility of ions, which is a physical quantity related to factors such as mass, size, collision cross section and dipole moment of ions and drift gas molecules, and it is also affected by external factors such as temperature and air pressure. influences. The ion mobi...

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Abstract

A method of using transient electric field to make shift electric field for shift tube of IMB includes utilizing transient electric field as shift electric field in shift tube of IMB, shifting all ion groups to region between shift electrode of m +1 and m +2 and m +3 at certain time slot, separately exerting proper voltages on three said shift electrodes at shift tube to satisfy certain conditions and forming transient electric field with strength E at region between three said electrodes at shift tube.

Description

technical field [0001] The invention relates to the technical field of detection, belongs to ion mobility spectrometer (IMS: Ion Mobility Spectrometer) technology, and in particular relates to a transient electric field and a method for generating a transient electric field used in a drift tube of an ion mobility spectrometer. Background technique [0002] Ion mobility spectrometry is a new detection technology developed in the late 1960s. It is somewhat similar to time-of-flight mass spectrometry, but ion mobility spectrometry does not require high vacuum conditions like mass spectrometry , but work at atmospheric pressure. Ion mobility spectrometer has good selectivity and high detection sensitivity, and is an effective tool for detecting trace explosives, drugs, and biochemical warfare agents. [0003] The ion mobility spectrometer separates different substances according to the difference in the mobility of ions in a weak electric field (about 200V / cm order) under atmos...

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Application Information

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IPC IPC(8): G01N27/64H01J49/00
Inventor 高晓光李建平何秀丽贾建郭会勇
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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