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Angular distributions from photodissociations. V. The bent triatomic molecule

机译:Angular distributions from photodissociations. V. The bent triatomic molecule

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The generalized Franckndash;Condon theory of bent triatomic molecule dissociations is extended to permit the calculation of statehyphen;tohyphen;state photofragment angular distributions. The axial recoil limiting forms of Zare and Bersohn are obtained for the statehyphen;averaged angular anisotropies bgr;macr; with corrections for the effects of bending vibrations. For certain orientations of the transition dipole within the molecule, bgr;fiis found to be nearly independent of fragment rotational angular momentumj, while for other orientations, it is found to be a strongly oscillatory function ofj. In some cases, calculated photofragment rotational distributions at fixed detection angles are strong functions of the detection angle, suggesting the possibility of partial state selection byspatialresolution. Approximate analytical expressions for bgr;fiare presented for initially bound molecular states that are either nonrotating or are well described by a prolate symmetric top wave function withk=0. The distributions are linear combinations of parallel and perpendicularhyphen;type distributions. Numerical applications are provided for direct photodissociations from the bentXtilde; HOC1 andCtilde; HCN states.

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