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H2-Broadening Coefficients in the ν4 Band of NH3

✍ Scribed by J.-P Bouanich; H Aroui; S Nouri; A Picard-Bersellini

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
157 KB
Volume
206
Category
Article
ISSN
0022-2852

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✦ Synopsis

H 2 -broadening coefficients have been measured for 66 rovibrational lines of NH 3 at room temperature in the P P and R P branches of the ν 4 band in the range 1470-1600 cm -1 , using a high-resolution Fourier transform spectrometer. The collisional widths are obtained by fitting Voigt profiles to the measured shapes of the lines. The broadening coefficients are found to decrease on the whole as J increases and they increase with K for a given J value. The results are compared with those calculated from a semiclassical model in which the inversion vibration of NH 3 and collision-induced transitions with K = 0 and K = ±3 are taken into account. The intermolecular potential used includes electrostatic, induction, and dispersion energy contributions. The calculations performed by considering only K = 0 transitions provide significantly lower broadenings but with a satisfactory J and K dependence. The same trends are obtained for the broadening coefficients in inversion-rotation transitions and in the Q branch of the ν 1 parallel band of NH 3 .

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