title: On the Speed-Dependent Hard Collision Lineshape Models: Application to C2H2 Perturbed by Xe
abstract: Three infrared absorption lines of the nu5 band of C2H2 diluted by Xe at pressures ranging from 40 to 300 mbar have been recorded at high resolution near 750 cm-1, using a tunable diode-laser spectrometer. Their lineshapes have been first analyzed by means of models using either the Dicke narrowing effect or the absorber speed-dependent collisional broadening and shifting. None of these models have given satisfactory results over the full pressure range of the perturber. It is shown that a correct treatment must include both line narrowing effects. We have investigated two possibilities of doing so: a convolution between two profiles corresponding to each effect and a noncorrelated and speed-dependent Rautian profile that we have developed here. The latter lineshape model appears to be the most appropriate. Copyright 1997 Academic Press. Copyright 1997Academic Press
authors.affiliation: Laboratoire de Spectroscopie Moleculaire, Facultes Universitaires Notre-Dame de la Paix, 61 rue de Bruxelles, Namur, B-5000, Belgium
authors.initials: B
authors.lastname: Lance
authors.initials: G
authors.lastname: Blanquet
authors.initials: J
authors.lastname: Walrand
authors.initials: JP
authors.lastname: Bouanich