TY - JOUR
T1 - Hydrogen line broadening in the v2 and v4 bands of phosphine at low temperature
AU - Salem, J.
AU - Aroui, H.
AU - Bouanich, J.-P.
AU - Walrand, J.
AU - Blanquet, G.
N1 - Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/11/1
Y1 - 2004/11/1
N2 - Using a tunable diode-laser spectrometer, we have measured H -broadening coefficients of PH at low temperature (173.2 K) for 27 lines in the R branch of the v band and in the P and P branches of the v band. The recorded lines with J values ranging from 2 to 11 and K from 0 to 9 are located between 1016 and 1093 cm. The collisional widths are determined by fitting each spectral line with a Voigt profile and a speed-dependent Rautian profile which provides slightly 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 weak electrostatic contributions. Except for three R(J,K) lines, where K = J, the calculated broadening coefficients are in good agreement with the experimental data. By comparing the results obtained at room and low temperatures, the temperature dependence of linewidths has been determined both theoretically and experimentally.
AB - Using a tunable diode-laser spectrometer, we have measured H -broadening coefficients of PH at low temperature (173.2 K) for 27 lines in the R branch of the v band and in the P and P branches of the v band. The recorded lines with J values ranging from 2 to 11 and K from 0 to 9 are located between 1016 and 1093 cm. The collisional widths are determined by fitting each spectral line with a Voigt profile and a speed-dependent Rautian profile which provides slightly 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 weak electrostatic contributions. Except for three R(J,K) lines, where K = J, the calculated broadening coefficients are in good agreement with the experimental data. By comparing the results obtained at room and low temperatures, the temperature dependence of linewidths has been determined both theoretically and experimentally.
UR - http://www.scopus.com/inward/record.url?scp=5444241030&partnerID=8YFLogxK
U2 - 10.1016/j.jms.2004.06.015
DO - 10.1016/j.jms.2004.06.015
M3 - Article
AN - SCOPUS:5444241030
SN - 0022-2852
VL - 228
SP - 23
EP - 30
JO - Journal of molecular spectroscopy
JF - Journal of molecular spectroscopy
IS - 1
ER -