Time-of-flight mass spectrometer detection chamber

Abstract

The invention belongs to the field of volatile organic compound analysis and detection, and particularly relates to a time-of-flight mass spectrometer detection chamber. The detection chamber comprises an acceleration electric field area located at the upper part, a field-free drift area located at the middle part and a reflection area located at the lower part, the acceleration electric field region is communicated with the reflection area through the field-free drift region, four polar plates are arranged in the acceleration electric field area, and the four polar plates are a bottom plate,an extraction polar plate, a middle polar plate and an acceleration electrode plate in sequence from top to bottom; and an XY deflection plate is arranged in the field-free drift region, and three groups of reflectors and detectors are arranged in the reflection region. According to the invention, the instrument resolution and the sensitivity of the detector can be improved, the influence of strayions on ion flight is reduced, and the ion utilization rate is high.

Description

technical field [0001] The invention belongs to the field of analysis and detection of volatile organic compounds, in particular to a time-of-flight mass spectrometer detection room. Background technique [0002] With the promulgation of the national "Ten Air Measures", the determination of volatile organic compounds in the air and exhaust gas has become the key content of atmospheric monitoring. In order to obtain real-time emissions of VOCs from enterprises or the content of VOCs in the ambient air of emergencies, it is possible to quickly measure VOCs in the air. Proton transfer reaction mass spectrometry (PTR-MS) has been widely used. At present, PTR-MS, which has been developed more, often has low resolution, which is mainly caused by the inconsistency of the velocity direction and size (velocity dispersion) and different positions (space dispersion) of the ion flow when it enters the detector. When entering the detection chamber, there are velocity dispersion and spac...

AI Technical Summary

Problems solved by technology

At present, PTR-MS, which has been developed more, often has low resolution, which is mainly caused by the inconsistency of the velocity direction and size (velocity dispersion) and different positions (space dispersion) of the ion flow when it enters the detector. When entering the detection chamber, there are velocity dispersion and space dispersion, which seriously restrict the sensitivity and resolution of the detector

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