The pure rotation spectrum of HBr in the submillimeter-wave region

Year: 1991

Authors: Di Lonardo G., Fusina L., De Natale P., Inguscio M., Prevedelli M.

Autors Affiliation: European Laboratory for Nonlinear Spectroscopy (LENS) Largo E. Fermi 2, 50125 Firenze, Italy;
Dip. di Chimica Fisica e Inorganica, Viale del Risorgimento 4, 40136 Bologna, Italy;
Dip. di Fisica dell’Università di Firenze, Largo E. Fermi 2, Firenze 50125, Italy

Abstract: The pure rotation spectra of both H79Br and H81Br were recorded at Doppler resolution by means of tunable far-IR (TuFIR) spectroscopy. The hyperfine structure of the rotational lines, due to the presence of the quadrupole moment in the bromine nucleus, was fully resolved. Rotational transitions, ?J = +1, ?F = 0, ±1 were measured and assigned with J ranging from 1 to 9. Forty-four and thirty-nine lines were observed in the region between 1.0 and 4.5 THz for H79Br and H81Br, respectively. These transitions were analyzed on the basis of a Hamiltonian containing terms up to the sixth power in the angular momentum, the first-order quadrupole interaction, and the nuclear magnetic interaction. The obtained spectroscopic parameters, which included the centrifugal distortion dependence of the quadrupole constant, here reported for the first time for a hydrogen halide molecule, reproduce the transition frequencies within the accuracy of the measurements.


Volume: 148 (1)      Pages from: 86  to: 92

KeyWords: pure rotation spectra
DOI: 10.1016/0022-2852(91)90037-B

Citations: 36
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