High-Resolution Laser Photoacoustic Spectroscopy of HSiF3: The 5ν1 and 6ν1 Overtone Bands

✍ Scribed by M. Lecoutre; T.R. Huet; E.B. Mkadmi; H. Bürger

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 151 KB
• Volume: 202
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2000.8127

✦ Synopsis

A spectrum of HSiF 3 has been recorded at room temperature with a gas pressure of 20 -50 Torr in the near-infrared region. A laser photoacoustic spectrometer consisting of a longitudinal resonant cell coupled to a titanium:sapphire ring laser was employed. The 5 1 and 6 1 overtone bands of H 28 SiF 3 associated with the Si-H stretching have been observed at high resolution (3 ϫ 10 Ϫ2 cm Ϫ1 ) in the regions 10 900 -10 960 and 12 875-12 925 cm Ϫ1 , respectively. About 450 lines of the 5 1 -0 band have been assigned ( J Յ 45, K ϭ 3p Յ 18). Within each J cluster of the P and R branches, the K structure has been deconvoluted. A set of parameters characterizing the upper vibration-rotation structure has been obtained. Perturbations have been evidenced for K ϭ 9 and 15. The characterization of the perturbed 6 1 -0 band was limited to J Յ 38, and effective parameters have been determined with no detailed information on the K structure. Most perturbations are supposedly due to the cubic anharmonic constant 144 linking n 1 to (n Ϫ 1) 1 ϩ 2 4 (n ϭ 5, 6) and to their accompanying interacting rovibrational states.