Hyperfine level dependence of pressure broadening in molecular spectra

Year: 2001

Authors: Belli S., Buffa G., Di Lieto A., Minguzzi P., Tarrini O., Tonelli M.

Autors Affiliation: Belli S., Buffa G., Di Lieto A., Minguzzi P., Tarrini O., Tonelli M., INFM and dipartimento di Fisica dell’università di Pisa

Abstract: The hyperfine dependence of collisional relaxation of molecular spectra is a not widely known effect which can be observed only under particularly favorable circumstances. While the absence of such an effect was observed for various molecules, a variation of the collisional broadening parameter with the hyperfine quantum number F was observed only for CH3I. All these results are explained in the frame of a theoretical model showing that a hyperfine F-dependence of the relaxation parameters is not due to the negligible influence of nuclear spin interaction on the collisional dynamics, but to the F-dependence of the matrix elements of the multipole of the absorber involved in the collisional relaxation of the line. A recent experimental investigation allows an accurate validation of the theoretical model.

Journal/Review: JOURNAL OF MOLECULAR STRUCTURE

Volume: 563-564      Pages from: 231  to: 233

KeyWords: pressure broadening; hyperfine effects;
DOI: 10.1016/S0022-2860(00)00807-3

Citations: 4
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