Patent ID: 8519327
Filing Date: 2013-08-27
Classification: H01J

Abstract:
1. A mass spectrometer in which an electron multiplier detector having multistage dynodes for sequentially multiplying electrons and an anode for finally detecting electrons multiplied by the dynodes is used as an ion detector, comprising: a) a power supplier including at least two direct-current power supplies in which voltages can be independently adjusted so that predetermined voltages are applied to each of the multistage dynodes and the anode; b) a signal provider for reading out a signal obtained by the anode and for reading out a signal obtained at least one of the multistage dynodes; and c) a signal processor for receiving a plurality of signals read out by the signal provider while voltages are applied to each of the multistage dynodes and the anode by the power supplier and for sequentially selecting one of the plurality of signals to reflect the selected signal in a signal intensity of a mass spectrum.