An Empirical Expression for Linewidths of Ammonia from Far-Infrared Measurements
Identifieur interne : 000786 ( Main/Exploration ); précédent : 000785; suivant : 000787An Empirical Expression for Linewidths of Ammonia from Far-Infrared Measurements
Auteurs : L. R. Brown [États-Unis] ; D. B. Peterson [États-Unis]Source :
- Journal of Molecular Spectroscopy [ 0022-2852 ] ; 1994.
Abstract
The hydrogen- and self-broadened linewidths of 116 14NH3 ground state transitions with J,K = 1,0 to 10,10 have been measured at 0.006-cm−1 resolution between 40 and 210 cm−1 using a Bruker spectrometer. These experimental widths have been reproduced to 2.4 and 11%, respectively, using a heuristically derived expression of the form γ = a0 + a1J″ + a2K″ + a3J″2 + a4J″K″, where J″ and K″ are the lower state symmetric-top quantum numbers. This function has also been applied to the measured widths of the 58 transitions of ν1, each broadened by N2, O2, Ar, H2, He [Pine et al., J. Quant. Spectrosc. Radiat. Transfer50, 337-348 (1993)], and NH3 [Markov et al., J. Quant. Spectrosc Radiat. Transfer50, 167-178 (1993)]. The rms of the observed minus calculated widths are ±5% or better for the five foreign broadeners. For the self-broadening case, the expression fails to reproduce the K = 0 data. The values of the fitted constants suggest that for some broadeners the expression might also be written as γ = a0 + b1J″ − a2(J″ − K″) + b3J″(J″ − K″).
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DOI: 10.1006/jmsp.1994.1305
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