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

De Natale, Paolo, Lorini, Luca, Inguscio, Massimo, Di Lonardo, Gianfranco, Fusina, Luciano, Ade, Peter A. R. and Murray, Alexander G. 1997. Improved sensitivity of tunable far-infrared spectroscopy: application to the detection of HBr in the v = 1 state. Applied Optics 36 (24) , pp. 5822-5826. 10.1364/AO.36.005822

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Abstract

We report the first detection of the pure rotational spectra of H79Br and H81Br 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 108. 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: The Optical Society
ISSN: 0003-6935
Last Modified: 04 Jun 2017 06:34
URI: http://orca.cf.ac.uk/id/eprint/62118

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