On the vibrational state dependence of the asymmetry parameter of angular distribution in the photoelectron spectra

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Abstract
A discussion is given on the changes obtainable in the asymmetry parameter β with vibrational state of the ion in the approximation involving fixed direction of body-frame orientation during the electron ejection. The R dependence of the electronic matrix elements is taken into account by calculation of appropriate displaced oscillator integrals. Inclusion of a nuclear matrix element gives in most cases negligible effect for the direct ionization. βν′ are calculated for H2 and N2. Expected variations in βν′ are compared with recent experimental data on N2 and CO. Higher partial waves and their effect on βν′ are discussed.
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