Spectral Lineshape Parameters Revisited for HF in a Bath of Argon: I. Widths and Shifts in the (0–0), (0–1), and (0–2) Bands

• Published in: Journal of molecular spectroscopy Vol. 198; no. 2; pp. 249 - 256
• Main Authors: Grigoriev, I.M., Le Doucen, R., Boissoles, J., Calil, B., Boulet, C., Hartmann, J.M., Bruet, X., Dubernet, M.L.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-12-1999
• Subjects: Fourier transform spectroscopy; HF in a bath of argon; widths and shifts; widths and shifts; Fourier transform spectroscopy; HF in a bath of argon
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1006/jmsp.1999.7903

The test of an interaction potential for HF–argon recently determined from the spectroscopy of the Van der Waals complex requires accurate experimental widths and shifts cross sections. Since inconsistencies existed between previous measurements, collisional lineshapes were studied at T = 296 K by high-resolution Fourier transform spectroscopy for the 0–0, 0–1, and 0–2 bands. The accurate close-coupling molecular scattering calculations of Green and Hutson (1994. J. Chem. Phys. 100, 891) were extended to a complementary set of kinetic energies in order to check the thermal averaging procedure. Agreement between measured and computed room temperature cross sections is excellent for the three vibrational bands. This confirms the accuracy of the HF–argon surface and particularly its dependence on the HF vibrational level, which is sensitively probed both by the widths and by the shifts cross sections at high ji values.