Resonances in electron scattering and features in photoelectron spectra are largely interpretable in terms of molecular obitals (MO). In particular, resonances in electron scattering may be viewed as manifestations of unoccupied MO's, and peaks in photoelectron spectra as manifestations of occupied MO's. Thus, the sub-ject matter is closely related to the chemieal-reactivity theory of Fukui and Hoffmann, in which the HOMO and LUMO play the central role. The present article discusses some recent notable findings in the broad sub-ject matter. The discussion includes also manifestations of vibronic couplings (viz., interactions between electronic and vibrational motions), which are especially important in highly excited and ionized states of molecules.
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