一种变气压试剂分子辅助光电离源
By separating the ionization region of reagent molecules from the reaction region of ion molecules in the photoionization source, and by using a segmented radio frequency quadrupole to improve the chemical ionization efficiency, the problems of window contamination and poor lamp stability under low vacuum conditions are solved, achieving higher detection sensitivity and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
- Filing Date
- 2022-07-28
- Publication Date
- 2026-07-17
AI Technical Summary
In existing photoionization sources, the reagent ionization region is connected to the sample ionization region, which makes the optical window easily contaminated by the sample under low pressure conditions, resulting in signal instability. Furthermore, the stability of vacuum ultraviolet lamps is poor under low vacuum conditions, affecting detection sensitivity.
A variable pressure reagent molecule-assisted photoionization source is designed to separate the reagent molecule ionization region from the ion molecule reaction region. After the reagent ions are generated under near-atmospheric pressure conditions, they enter the ion molecule reaction region with lower pressure through capillary tubes and differential electrode orifices, where they chemically ionize with the sample. The chemical ionization efficiency is improved by using a segmented radio frequency quadrupole.
It effectively avoids light window contamination, improves the stability and detection sensitivity of the photoionization source, and enhances chemical ionization efficiency.
Smart Images
Figure CN117524839B_ABST