Some Characteristics of the New Type CEM as an Ion Detector of the Mass Spectrometer

Abstract

A bulk type CEM is more advantageous to ultra-high vacuum applications than a thin film type CEM because of its temperature stability. We studied the gain and fatigue of this new type of CEM as an ion detector. The gain is less than that of the commercial thin film type because of its shape and the material used, but it has a wider dynamic range. Its gain fatigue with increase of total counts is comparable to that of the thin film type.