Abstract
The quantum number dependence of self- and air-broadening coefficients of 33 transitions in the ν3band of SO2with 4 ≤J″ ≤ 61, 0 ≤Ka″ ≤ 18 was measured with a pulse-driven diode laser spectrometer. Twenty-five lines of theP-branch, five lines of theR-branch, and three lines of theQ-branch were studied. The self-broadening coefficients[formula]vary between 0.151 and 0.498 cm−1/atm. For smallKa″ values the self-broadening coefficients[formula]show a strong scattering of data, whereas a pronounced decrease with increasing quantum numberKa″ was found for lines withKa″ ≥ 10. ForKa″ values of about 3, the largest broadening coefficients were measured. No significant tendency in theJ″ dependence was found. Quantum number dependence and absolute values are in good agreement with previous experimental results for the ν1band of SO2. The situation in the case of collisions with air is similar, where the[formula]values vary between 0.061 and 0.130 cm−1/atm and no significant dependence of the broadening coefficients was observed as in the case of the ν1band.
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