Abstract

Double photoionization of CO 2, OCS, C 2H 2, CF 4 and C 6H 6 molecules has been studied in an electron-electron coincidence experiments, where nearly zero kinetic energy (⩽20 meV) electrons are detected. This first application of TPEsCO spectroscopy to polyatomic molecules confirms the ability of this experimental technique to determine accurate double ionization potentials and locate excited electronic states. The spectrum of benzene reveals what appears to be the first observation of vibrational structure in a polyatomic dication.

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