Absorption Intensities, Pressure-Broadening and Line Mixing Parameters of Some Lines of Nh3 in the Ν4 Band

Fourier Transform Infrared Spectroscopy for the Measurement of Spectral Line Profiles

“…As expected the line intensities in the ν 2 band (Aroui et al, 2003) are much larger than those reported previously (Aroui et al, 1998;Cottaz et al, 2001;Hadded et al, 2001) for the ν 4 band and also several times larger than the intensities in the ν 1 and ν 3 bands (Markov, 1993).…”

“…The values are reported in previous work (Aroui et al, 1998 (Aroui et al, 2003) 3.5 Pressure broadenings…”

“…For the ν 4 band, the correction function, the vibrational transition moments and the correction parameters are reported previously (Aroui et al, 1998). For this band significant differences between the correction parameters obtained for the symmetric and asymmetric transitions, so one can determine the vibrational band strengths, V 0S…”

“…(17) show significant rotational dependencies (Aroui et al, 1998(Aroui et al, , 2003 which are mainly caused by vibration-rotation interactions (l-type interactions in the ν 4 band and Coriolis interaction between ν 4 and 2ν 2 bands): they decrease with J for a fixed value of K and increase with K for a given J.…”

“…Measurements of these effects have been reported for CH 3 F (Thibault et al, 1999), CH 3 Cl (Hartmann et al, 1995) and CH 3 Br (Tran et al, 2008). Otherwise, for NH 3 , which presents line doubling due to its inversion motion, line-mixing effects were the subject of numerous works (Aroui et al, 1998(Aroui et al, , 2009Dhib et al, 2007;Hadded et al, 2001). These works have clearly demonstrated the necessity of taking into account line-mixing in the molecular spectra.…”