Wide-band spectroscopic investigation of the state-to-state dependence of the ArH+ ion average mobility in a Ar/He plasma

A wide-band experimental study on the quantum dependence of an ion average mobility in the positive column of a glow discharge is reported: no vibrati onal nor rotational energy dependence of the ArH+ ion average mobility in a mixture Ar/He is observed, within an experimental uncertainty of 5%. This conclusion is obtained from electric field-induced Doppler-shift measuremen ts in the Delta upsilon = 1 sequence vibration-rotation bands, around 5 mu m. Two approaches, involving high-resolution Fourier transform spectroscopy , are employed. The two results agree well. (C) 1999 Elsevier Science B.V. All rights reserved.