大気圧イオン化法を用いた直交加速型飛行時間質量分析計の収差とスペクトル分解能

概要

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Discussion on the spectral mass resolution is made on an orthogonal acceleration time-of-flight mass spectrometer, which consists of a two-stage acceleration and a one-stage reflecting mirror, coupled with an atmospheric pressure ionization technique. Even though taking the second order space focusing as well as the turn-around effect into account, the mass resolution is lowered by the influence of several optical parameters such as the diameter of the orifice located after an external ion source, the beam deflection by a grid, and the charging-up voltage in an ion storage. It is found that both the charging-up effect and the beam deflection by the grid located in the two-stage ion acceleration region can be corrected in some extent by selecting a suitable mirror voltage. However, the most influential parameter is the beam diameter at an orifice. This influence on the mass resolution cannot be corrected.
日本質量分析学会の論文
2000-12-01