Energy distributions of emitted ion fragments following C(1s) excitations in CO.

Abstract

Ion-branching ratios following the relaxation of C (1${\mathit{s}}^{\mathrm{\ensuremath{-}}1}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{*}}$,nl\ensuremath{\lambda},${\mathit{v}}^{\ensuremath{'}}$) synchrotron light-excited, vibrationally resolved resonances in CO have been measured using a time-of-flight spectrometer at high extraction voltages. Additional measurements at low extraction voltages (higher kinetic-energy resolution) have enabled an estimate of the kinetic-energy distributions (KED's) of the emitted ${\mathrm{C}}^{+}$, ${\mathrm{O}}^{+}$, ${\mathrm{C}}^{2+}$, and ${\mathrm{O}}^{2+}$ ions. Large differences in these distributions are observed at various resonances and, for instance, a doorway-state dependence of the KED has been found for the 3s\ensuremath{\sigma} and 3p\ensuremath{\pi} Rydberg resonances. While the results give some different information concerning the involved relaxation processes, more theoretical calculations are needed to get a more quantitative understanding. \textcopyright{} 1996 The American Physical Society.