Pressure broadening of the 2.4978-THz rotational lines of HO2 by N2 and O-2

Year: 1994

Authors: Chance K., De Natale P., Bellini M., Inguscio M., Di Lonardo, G. Fusina L.

Autors Affiliation: Harvard Smithsonian CTR Astrophysics, Cambridge, MA 02138 USA;
Dipartimento di Fisica, Universitą di Firenze and European Laboratory for Nonlinear Spectroscopy (LENS) Largo E. Fermi 2, 50125 Firenze, Italy;
Dipartimento di Chimica Fisica e Inorganica, Universitą di Bologna, 40136 Bologna, Italy

Abstract: We have measured the room temperature N2 and O2 pressure-broadening coefficients for the 2.4978-THz 132,12 ? 121,11J = 27/2 ? 25/2 line of HO2 consisting of two unresolved hyperfine components. The measurements were made at the European Laboratory for Nonlinear Spectroscopy in Florence. Italy, using a tunable far-infrared spectrometer (TuFIR). based on the mixing of radiation from two CO2 lasers and a microwave synthesizer on a metal-insulator-metal (MIM) diode. The pressure-broadening results obtained, and their 1s uncertainties, are aN2 = 47.4 ± 4.4 kHz/Pa (6.3 ± 0.6 MHz/Torr) and aO2 = 19.9 ± 1.6 kHz/Pa (2.7 ± 0.2 MHz/Torr); this corresponds to aair = 41.6 ± 3.8 kHz/Pa (5.6 ± 0.5 MHz/Torr).

Journal/Review: JOURNAL OF MOLECULAR SPECTROSCOPY

Volume: 163 (1)      Pages from: 67  to: 70

KeyWords: stratospheric HO2; spectroscopy; OH; spectrum; region
DOI: 10.1006/jmsp.1994.1007

Citations: 15
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