N2 -broadening coefficients in the ν2 and ν4 bands of PH3

J.-P. Bouanich, J. Walrand, G. Blanquet

Research output: Contribution to journalArticlepeer-review


N2-broadening coefficients are measured for 61 transitions of PH in the R branch of the ν band and the P, P, P, and Q branches of the ν band, using a tunable diode-laser spectrometer. The recorded lines with J values ranging from 1 to 16 and K from 0 to 11 are located between 1008 and 1106 cm . The collisional widths are determined by fitting each spectral line with a Voigt profile, a Rautian profile, and a speed-dependent Rautian profile. The latter models provide larger broadening coefficients than the Voigt model. These coefficients have also been calculated on the basis of a semiclassical model of interacting linear molecules by considering an atom-atom Lennard-Jones potential in addition to the electrostatic contributions. The theoretical results are in good agreement with the experimental data and reproduce the J dependence of the broadenings, but their decrease at high J values is overestimated for the R (J, K) transitions.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalJournal of molecular spectroscopy
Issue number1
Publication statusPublished - 1 Jul 2005


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