Doppler Shift and Ion Mobility Measurements of ArH+in a He dc Glow Discharge by Infrared Laser Spectroscopy

Abstract
A new, infrared-laser-spectroscopic method for in situ ion drift-velocity and mobility measurements in a dc glow discharge is reported, a method sensitive to quantum effects in the ion transport process. Excellent agreement with earlier drift-tube studies for the mobility of ArH+ in He is obtained. While no ion rotational energy dependence was observed in preliminary measurements, a vibrational dependence was suggested.