Diode-Laser Measurements of N2-Broadening Coefficients in the ν2 Band of HCN at Low Temperature

✍ Scribed by C. Schmidt; J.C. Populaire; J. Walrand; G. Blanquet; J.P. Bouanich

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 429 KB
• Volume: 158
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1993.1086

✦ Synopsis

(\mathrm{N}{2})-broadening coefficients have been measured for 28 lines of (\mathrm{HCN}) at (203 \mathrm{~K}) in the (P, Q). and (R) branches of the (\nu{2}) band, using a tunable diode-laser spectrometer. Semiclassical calculations of these collisional broadenings have been performed using two intermolecular anisotropic potentials as well as two isotropic potentials to describe the trajectory model: one is the Lennard-Jones potential, and the other is a spherical average of the atom-atom model. The parameters of the atom-atom model and those of the Lennard-Jones potentials have been calculated for HCN by fitting experimental values of second virial coefficients. The calculated broadening coefficients are significantly larger, especially for the lines with (J>10), than 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. c 1993 Academic Press. Inc.