# AN EMPIRICAL EXPRESSION FOR LINE WIDTHS OF AMMONIA FROM FAR-INFRARED MEASUREMENTS

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 Title: AN EMPIRICAL EXPRESSION FOR LINE WIDTHS OF AMMONIA FROM FAR-INFRARED MEASUREMENTS Creators: Brown, L. R.; Peterson, D. B. Issue Date: 1994 Abstract: The hydrogen-broadened line widths of 116 ${^{14}}NH_{3}$ ground state traditions between $J,K = 1,0$ to 10,10 have been measured at $0,006 cm^{-1}$ resolution using a Bruker spectrometer in the 40 to $210 cm^{-1}$ region. These experimental data have been fitted to $\pm 3%$ using an heuristically derived expression of the form $\gamma=a_{o}+a_{1} J+a_{2} K + a_{3} J^{2} + a_{4} JK$ where J and K are the lower stale symmetric top quantum numbers. This function has also been applied to widths of 58 transitions near 3 $\mu m$ reported by Pine et al. (J. Mol. Spectrosc 50, 337-348, 1992). The percent differences between the observed and calculated widths are 5% or better for five foreign broadeners $(N_{2} O_{2}, Ar H_{2}$ and He). For the self-broadening, the expression fails to reproduce the $K=0$ data, and rms rises to 11%. URI: http://hdl.handle.net/1811/13056 Other Identifiers: 1994-ME-11