Experimental and theoretical study of line shift and mixing in the ν4 band of NH3 perturbed by N2 |
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Authors: | Mohamed Dhib Hassen Aroui |
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Institution: | a Laboratoire de Physique Moléculaire, Ecole Supérieure des Sciences et Techniques de Tunis, 5 Av Taha Hussein 1008 Tunis, Tunisia b Laboratoire Interuniversitaire des Systèmes Atmosphériques, Universités de Paris 7 et 12, CNRS UMR 7583, 61 av. du Général de Gaulle, 94010 Créteil Cedex, France |
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Abstract: | The shift coefficients and line-mixing parameters of rovibrational-inversion transitions in the ν4 band of ammonia (NH3) perturbed by nitrogen (N2) have been measured at room temperature with a high-resolution Fourier transform spectrometer. The collisional shift and line mixing are obtained from the non-linear least-square multi-pressure fitting techniques. Comparison is made with the results of theoretical calculation based on semi-classical model extended to the case of symmetric top molecule with inversion motion. The shifts and the line-mixing parameters are calculated using, respectively the approach developed by Robert and Bonamy and the state-to-state cross-section. The agreement is satisfactory on the average. Good agreement is also obtained for line mixing with previous measurements. |
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Keywords: | Shift Line mixing Semiclassical calculations State-to-state cross-section Ammonia |
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