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The isomeric distribution of metastable “photomerocyanines” produced by UV‐photolysis of spiroindolinonaphthoxazine derivatives is examined by resonance‐enhanced CARS spectroscopy. — In unpolar and polar aprotic solvents CARS spectra prove the existence of two pairwise similar isomeric species. They differ, however, in Franck‐Condon factors for excitation S0 → S1. In the protic solvent methanol an additional isomer is found for certain derivatives.
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Schneider et al. (1987) studied this question.
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