Experimental Investigation of the Self-Broadening Coefficients in the ν1+ ν3Band of SO2and the 2ν2Band of H2S

✍ Scribed by B. Sumpf

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 274 KB
• Volume: 181
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.7168

✦ Synopsis

The self-broadening coefficients for 118 lines in the n 1 / n 3 band of 32 SO 2 , 5 lines in the n 1 / n 3 band of 34 SO 2 , 10 lines in the n 1 / n 2 / n 3 0 n 2 band of 32 SO 2 , and 13 lines in the 2n 2 band of H 2 S were measured in the spectral region between 2464 and 2503 cm 01 by applying a tunable diode laser spectrometer. The transitions from the n 1 / n 3 band of 32 SO 2 cover the quantum number range 2 £ JЉ £ 48, 0 £ KЉ a £ 16 and contain 66 lines from the P-branch, 46 lines from the Q-branch, and 6 lines from the R-branch. The self-broadening coefficients vary between 0.240 cm 01 /atm £ g SO 2 -SO 2 £ 0.504 cm 01 /atm. As with previously studied bands of SO 2 a pronounced decrease of the broadening coefficients with increasing quantum number KЉ a was found. On the other hand, a significant trend on JЉ could not be stated. Altogether, the absolute values of the self-broadening coefficients are comparable. For the self-broadening coefficients from the 2n 2 band of H 2 S with 4 £ JЉ £ 13, 1 £ KЉ a £ 5 a decrease of the broadening coefficient with increasing JЉ is obvious, whereas no KЉ a -dependence was found even when recently published data for the three fundamental bands were included. This corresponds to the different sizes of the rotational constants of SO 2 and H 2 S. For the n 1 / n 3 band of SO 2 , lines from different branches but with identical ground state could be compared. As typical behavior, a trend g R-branch õ g Q-branch õ g P-branch was found, as predicted by theoretical values.