Abstract
Using a photoelectron imaging technique, remarkable variations of photoelectron angular distributions are demonstrated in the region of autoionization resonance states of a two-photon excited I-atom. It is shown that the observed energy evolution of angular variation exhibits Fano-like behaviour and can be parametrized, for an isolated autoionization state, using the theoretically proposed scaling relationship for the width and the energy shift with respect to the absorption spectrum of the autoionizing state. In the case of overlapping resonances, however, it is found that the scaling relationship fails to account for the energy dependences of the β4 parameters, though it remains valid for the β2 spectra. Possible reasons are discussed.
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