Abstract
We report a photoelectron imaging study of the radical-anion of glyoxal. The 532nm photoelectron spectrum provides the first direct spectroscopic determination of the adiabatic electron affinity of glyoxal, EA=1.10±0.02eV. This assignment is supported by a Franck-Condon simulation of the experimental spectrum that successfully reproduces the observed spectral features. The vertical detachment energy of the radical-anion is determined as VDE=1.30±0.04eV. The reported EA and VDE values are attributed to the most stable (C2h symmetry) isomers of the neutral and the anion.
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