title: Mechanism of anion formation in C 1s-->pi*-excited carbon dioxide.
abstract: The mechanism of anion formation from core-excited carbon dioxide is investigated in the C 1s-excitation regime (280-340 eV), where negative-ion-positive-ion coincidences and negative-ion-positive-ion-positive-ion coincidences experiments are performed. O(-) formation occurs efficiently upon C 1s-->pi(*)-excitation (290.7 eV) from the singly charged cation CO(2) (+). This anion is measured in coincidence with the singly charged atoms C(+) and O(+). The formation of atomic cations is accompanied by a substantial kinetic energy release. This suggests that an intermediate CO(++) is formed together with O(-), where the dication decays via fission. The results are discussed in terms of an anion formation mechanism from core-excited molecules considering previous experimental results.
authors.affiliation: Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Rühl
authors.forename: R
authors.initials: R
authors.lastname: Flesch