50) Eberhardt, W.; Sham, T. K.; Carr, R.; Krummacher, S.; Strongin, M.; Weng, S. L.; Wesner, D. A fluorescence excitation spectrum of formic acid monomer (HCOOH) has been recorded in the 268-257-nm region and has been attributed to an n -+ K* electron promotion in the anti conformer. The So -SI electronic origins of the HCOOH/HCOOD/DCOOH/DCOOD isotopomers were assigned to weak bands observed at 37 431.5/37 461.5/ 37 445.5/37 479.3 cm-I. Four vibrational modes, u3(c=o), v7(o-c=o), u8(C-HaId), and u9(0-Hh d), were observed in (3) Brouard. M.f O'Mahony, J. Chem Phys . i e t t . 1988. 149, 45. is expected to be nonplanar as well. The SI states of the

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