Abstract
Abstract We observe in glyoxal cooled in a supersonic free jet the fluorescence of individual rotational levels of the S 1 state excited by a cw laser. We use the technique of singlet—triplet magnetic resonance near an anticrossing to measure matrix elements V 31 as a function of rotational quantum numbers N s , N t , K s , K t . The experimental results are compared with theoretical models of singlet—triplet couplings and we show that the spin-vibronic interaction is the dominant singlet—triplet interaction in glyoxal.
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