Pressure-broadening of water lines in the THz frequency region: Improvements and confirmations for spectroscopic databases. Part I

Year: 2008

Authors: Cazzoli G., Puzzarini C., Buffa G., Tarrini O.

Autors Affiliation: Dipartimento di Chimica Ciamician, Università di Bologna;
IPCF-CNR e Dipartimenyo di Fisica, Università di Pisa

Abstract: The self-, nitrogen- and oxygen-broadening of the J = 7,2,5 8,1,8 (1.147 THz), 8,5,4 7,6,1 (1.168 THz), 7,4,4 6,5,1 (1.173 THz), 8,5,3 7,6,2 (1.191 THz), and
6,3,3 5,4,2 (1.542 THz) rotational transitions of water have been experimentally and theoretically investigated in the present work, revealing that the corresponding
HITRAN self-broadening parameters are a®ected by large errors. Indeed, simple semiclassical calculations performed for more than 1500 rotational water lines with
frequency lower than 1000 cm¡1 allow us to improve the self-broadening values reported in the HITRAN database when obtained by assuming a J dependence. On the other hand, our measurements and calculations confirm the values reported in the HITRAN database for air-broadening and shift, which are based on semiclassical computations as well. On the whole, the present investigation provides new experimental as well as theoretical improved values for self-broadening parameters of rotational lines in the THz frequency regions.

Journal/Review: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER

Volume: 109 (17-18)      Pages from: 2820  to: 2831

More Information: This work has been supported by University of Bologna (RFO funds).
KeyWords: Pressure broadening; Pressure shift; Rotational transition; Water; Semiclassical calculations
DOI: 10.1016/j.jqsrt.2008.07.012

Citations: 12
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