Rotation-dependent intramolecular processes of SO2(Ã1A2) in a supersonic jet

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Abstract
Rotationally cooled SO2 is prepared through supersonic expansion of its seeded mixture in Ar and is excited to the first electronically allowed state by a frequency-doubled dye laser pulse in the wavelength range of 300–320 nm, in particular, in “E” and “G” bands region, using Clements' notation. In the time-resolved fluorescence measurements with a 0.02 cm–1 excitation bandwidth, all of the rovibronic levels examined exhibit apparent biexponential decay having a short lifetime of 3–5 µs and a long one of 15–30 µs. With application of a weak magnetic field (g-values distribute rather irregularly over a wide range, which indicates a complicated coupling among the relevant electronic states. At present the coupling mechanism which causes a sizeable magnetic moment seems to be quite independent of the coupling mechanism which results in the observed apparent biexponential decay.

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