Abstract
Zeeman studies have been carried out at fields between 1 and 7kG on some previously recorded microwave-optical double resonance signals of thioformaldehyde. The microwave transitions originate in the J 0.J rotational levels of the 41 A 1 A 2 excited state and terminate in highly excited rovibronic levels of the [Xtilde] 1 A 1 ground state. By observations in parallel (ΔMJ = 0) and perpendicular (ΔMJ = ± 1) polarizations, rotational g-factors for the two combining levels are determined. The interpretation of the results is facilitated by carrying out the measurements with both parallel and perpendicular polarizations of the microwave and optical fields. The effective g-factors for the highly excited levels of the [Xtilde] 1 A 1 ground state support the earlier proposition that Ka is not a good quantum number for these levels.
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