Mobility of Ar⁺ Ions in He Gas at 82 K

Abstract

Mobility of Ar⁺ ions in He gas was studied at 82 K. An injected-ion drift tube mass spectrometer, the drift tube of which can be cooled with liquid nitrogen was developed for this purpose. The mobility curve obtained has a bump at the intermediate E⁄N, and the zero-field reduced mobility has approached to the polarization limit. The peculiarities of ionic mobility in He gas are explained.