Imaging mass spectrometer and method of controlling same

摘要

An imaging mass spectrometer capable of reducing the dependence of the resolution of a projection image on mass is offered. Also, a method of controlling this spectrometer is offered. The imaging mass spectrometer includes: a plate on which a sample is placed; a lens system through which ions generated by irradiating the sample with laser light pass; an ion optical system for separating the ions according to flight time corresponding to mass-to-charge ratio; a detection system for measuring arrival positions and flight times of the ions passed through the ion optical system and generating an image of the sample when it is ionized; and a voltage control portion for sweeping the voltage applied to an electrode included in the lens system such that the lens effect of the lens system increases with time during a given period synchronized with the laser irradiation.

主权项

1. An imaging mass spectrometer comprising:
an initial stage lens system comprising a plate on which a sample is placed, an extraction electrode for extracting ions generated by irradiating the sample with laser light, and a terminal electrode; an acceleration stage lens system having an electrode for accelerating the ions extracted from the sample in the initial stage lens system; an ion optical system for separating the ions according to flight time corresponding to mass-to-charge ratio; a detection system for measuring arrival positions and flight times of the ions passed through the ion optical system and generating an image of the sample when it is ionized; and a voltage control portion for sweeping the voltage applied to the plate or the extraction electrode such that the lens effect of the initial stage lens system contributing to the magnification ratio of the image increases with the elapse of time during a given period synchronized with the laser irradiation.