Quantum Number and Temperature Dependence of Foreign Gas-Broadening Coefficients in the ν1and ν3Bands of SO2: Collisions with H2, Air, He, Ne, Ar, Kr, and Xe
✍ Scribed by B. Sumpf; M. Schöne; O. Fleischmann; Y. Heiner; H.-D. Kronfeldt
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 263 KB
- Volume
- 183
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
To complete our studies concerning collisional line broadening in the fundamental bands of SO 2 , hydrogen-broadening coefficients for 21 lines from the n 3 band between 1341 and 1357 cm 01 with 8 £ JЉ £ 33, 1 £ KЉ a £ 16, heliumbroadening coefficients for 3 lines from the n 1 band around 1121 cm 01 with 8 £ JЉ £ 36, 7 £ KЉ a £ 9, and xenonbroadening coefficients for 6 lines from the n 3 band between 1321 and 1366 cm 01 with 4 £ JЉ £ 61, 0 £ KЉ a £ 6 and 15 lines from the n 1 band between 1072 and 1140 cm 01 were measured at room temperature applying a high-resolution lead-salt diode laser spectrometer. For collisions with noble gases the temperature dependence in the range between 252 and 362 K was studied for three lines from the n 3 band. For the same temperature interval the air-broadening coefficients of seven lines from the n 3 band were determined. The hydrogen-broadening coefficients are larger than those previously published for air broadening, but show the same quantum number dependence. A weak maximum in the KЉ a dependence and no trend in the JЉ dependence are observable. In contrast to this and to the well-studied quantum number dependence of the self-broadening coefficients a more pronounced JЉ dependence but no significant KЉ a dependence was measured in the case of collisions with noble gas perturbers. Temperature exponents of 0.72 £ n £ 0.99 (average value 0.83) for the air-broadening coefficients were observed. The smaller exponent of about 0.7 determined for noble gas collisions is in good agreement with theory. Due to the large uncertainties for the n values caused by the restricted temperature range a perturber dependence can only be supposed. Nevertheless, the data are close to the theoretical prediction.