Study of singlet—triplet coupling in glyoxal by level anticrossing spectroscopy. V. Nature of singlet—triplet interaction |
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| Authors: | P. Dupre R. Jost M. Lombardi |
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| Affiliation: | Laboratoire de Spectrométrie Physique, Université Scientifique et Médicale de Grenoble, BP 87, 38402 Saint Martin d''Heres Cedex, France;Service National des Champs Intenses, Centre National de la Recherche Scientifique, BP 166 X 38042 Grenoble Cedex, France |
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| Abstract: | We observe in glyoxal cooled in a supersonic free jet the fluorescence of individual rotational levels of the S1 state excited by a cw laser. We use the technique of singlet—triplet magnetic resonance near an anticrossing to measure matrix elements V31 as a function of rotational quantum numbers Ns, Nt, Ks, Kt. 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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