Improved sensitivity of tunable far-infrared spectroscopy: application to the detection of HBr in the v=1 state

Year: 1997

Authors: De Natale P., Lorini L., Inguscio M., Di Lonardo G., Fusina L., Ade P.A.R., Murray AG.

Autors Affiliation: European Laboratory for Non-Linear Spectroscopy
and the Department of Physics, University of Firenze, Largo E. Fermi 2, I-50125 Firenze, Italy;
Dipartimento di Chimica Fisica e Inorganica, University of Bologna, Viale Risorgimento 4,
I-40136 Bologna, Italy;
Department of Physics, Queen Mary and Westfield College, Mile End Road, London E1 4NS, United Kingdom

Abstract: We report the first detection of the pure rotational spectra of (HBr)-Br-79 and (HBr)-Br-81 in , the first excited vibrational state at room temperature. We recorded the spectra with a tunable far-infrared spectrometer equipped with an optimized Ge:Ga photodetector and an improved multiple-pass gas cell to enhance the overall sensitivity. In particular, a minimum detectable absorption of better than 10(-7) cm(-1) was achieved. We measured a total of 60 frequencies for the two isotopomers with an accuracy of a few parts in 10(8). The hyperfine structure was observed at the lower J values. The derived spectroscopic parameters, which include nuclear and quadrupole hyperfine constants, reproduce the assigned transitions within their experimental errors. (C) 1997 Optical Society of America.

Journal/Review: APPLIED OPTICS

Volume: 36 (24)      Pages from: 5822  to: 5826

KeyWords: far-infrared spectrometers; molecular spectroscopy;
DOI: 10.1364/AO.36.005822

Citations: 13
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