NH3 self-broadening coefficients in the ν2 and ν4 bands and line intensities in the ν2 band

• Autores: H. Aroui, S. Nouri, J.-P. Bouanich
• Localización: Journal of molecular spectroscopy, ISSN 0022-2852, Vol. 220, Nº 2, 2003, págs. 248-258
• Idioma: inglés
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• Resumen

  • Self-broadening coefficients of NH3 in the ν2 and ν4 bands and absolute line intensities in the ν2 band have been measured at room temperature for some selected lines in the P- and R-branches. Using a Fourier transform spectrometer, line intensities and collisional widths were obtained by fitting Voigt profiles to the measured shapes of the lines. The results of self-broadening coefficients are in reasonable agreement with calculated linewidths using a semiclassical model which reproduce rather well the systematic experimental J and K quantum numbers dependencies. Satisfactory agreement was also obtained for line intensities with previous measurements in the ν2 band. From the intensity measurements, we have determined effective transition dipole moments as well as Herman–Wallis parameters for the ν2 band.