Vibrationally Selected O+−O+ Fragmentation of O2 below the Adiabatic Double-Ionization Potential Studied via Electron-Electron Coincidence Spectroscopy

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Abstract
Mechanisms for O2 photofragmentation leading to the formation of the O+−O+ ion pairs, at photon energies below the adiabatic double-ionization threshold, have been investigated using a threshold-photoelectron-photoelectron coincidence technique. The selectivity and high efficiency of the experimental technique have allowed the process to be followed step by step. The measurements show that fast dissociation of a singly charged ion, followed by atomic autoionization, is the dominant decay route in this energy region.

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