Rotational relaxation studies of HF using ir double resonance

Publisher Website
Google Scholar
Abstract
Rotational relaxation effects in HF were observed with double resonance ir experiments. Two single wavelength lasers were employed: a pulsed laser was used to pump a population to a particular vibrational–rotational level, and a stable cw laser was used as an absorption probe to determine the loss or arrival of population in specific J levels. Results are described for both the rotational transfer rates and the temporal behavior of the population distribution over rotational levels after the population was placed in a single level. Rotational transfer rates were found to be three orders of magnitude faster than V–T relaxation and to vary with ΔJ. The data for rotational relaxation were compared with a rate equation model and rate constants for individual relaxation steps were obtained.