An Atmospheric Pressure Microwave Plasma Excitation Source Device and Its Application

A technology of microwave plasma and excitation source, which is applied in the field of chemical measurement, can solve the problems of prolonging sample analysis time, requirement of sample shape, insufficient ionization ability, etc., and achieve the effects of not easy quenching, strong sample tolerance, and reduced interference
CN104994675BInactive Publication Date: 2017-10-31ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2017-10-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a microwave plasma excitation source at atmospheric pressure, including an inner tube, a middle tube, an outer tube, a calibration pad, a microwave feed-in interface, a coaxial cable SMA connector, a tuning piston, a side-end gas introduction port, and a lower-end gas introduction port and coaxial channels. The invention has a three-tube coaxial structure to form a plasma with a central channel, which can not only work stably under high-power microwave conditions, but also be excited and used under low-power conditions; stable He plasma can be obtained under normal pressure, with Strong excitation ability and wide measurement range; it can reduce background emission and interference; diversification of ionization modes: it can not only introduce samples into the inner tube for analysis, but also directly monitor the surface of samples in real time. The invention has reasonable design, simple structure, simple operation and wide application, can be used for mass spectrometer ion source, spectrometer excitation source, etc., does not need sample pretreatment, has strong sample bearing capacity and wide measurement range.
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Description

technical field

[0001] The invention belongs to the technical field of chemical measurement, and relates to an atmospheric pressure microwave plasma excitation source device, which relates to a device using 5.8Ghz (other frequency microwave sources can also be used) microwave atmospheric pressure excitation plasma. Background technique

[0002] Direct ionization technology represented by atmospheric pressure desorption ionization source is a revolutionary development in the field of mass spectrometry in recent years, and its importance to work and scientific research is immeasurable. However, the existing atmospheric desorption ionization source has the defects of insufficient ionization ability, limited ionization range, and requirements for the shape of the sample, which are not enough to meet people's requirements, and often require pretreatment of the sample before analyzing the sample. It will prolong the time of sample analysis, and the introduced pretreatment reagent ...

Claims

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