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Pressure Broadening and Shift of Some H2O Lines in the ν2Band: Revisited

✍ Scribed by N. Schmücker; Ch. Trojan; T. Giesen; R. Schieder; K.M.T. Yamada; G. Winnewisser

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
156 KB
Volume
184
Category
Article
ISSN
0022-2852

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✦ Synopsis

Pressure-induced line broadening and line shift of three rovibrational transitions in the n 2 band and three in the 2n 2 0 n 2 hot band of H 2 O at 7 mm were remeasured, using the wavelength-stabilized Cologne diode laser spectrometer with an upgraded recording system: the determination of the absolute line positions was better than 1 MHz, whereas the sensitivity and the long-term stability were improved by at least a factor of 10. The shift coefficient was found to be linearly dependent on the mixing ratio of the foreign gases oxygen and nitrogen for all transitions investigated, including the 13 2,12 R 14 1,13 transition for which we previously reported a nonlinear behavior. This greatly improved consistency of the present experimental data sets allows a check on the applicability of various profile functions: a comparison between the Galatry and a Voigt profile function with floating Doppler width indicates that both reproduce the experimental values very well. Purely the ease of use gives the edge to the Voigt profile with floating Doppler width.

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