Design and Study of Ionizer of QMS with Threshold Ionization Function

The first electron beam bombarding ionizer with threshold ionization function in China was developed by us.The electron energy of the ionizer can be continuously changed from 8. d to 95 eV. The width limit of electron energy is about 0. 5eV. Using the ionizer,we have selective1y detected N2/CO and measured the relative cross-section of ionization of several species.