Kinetic-energy- and angular-resolved fragmentation of CO in vibrational-resolved C 1s excitation.

Angular distributions of ${\mathrm{C}}^{+}$+${\mathrm{O}}^{+}$ from CO were measured, following vibrationally resolved C 1s excitations into the 2p\ensuremath{\pi}, 3s\ensuremath{\sigma}, and 3p\ensuremath{\pi} orbitals as well as into higher unresolved orbitals. A time-of-flight mass spectrometer, with a multihit-type position-sensitive anode, was used for the measurements. The anisotropy parameters (\ensuremath{\beta}) of ${\mathrm{C}}^{+}$+${\mathrm{O}}^{+}$ approach their theoretically expected values as the released kinetic energy in the fragmentation increases. The value of the \ensuremath{\beta} parameters remains constant for all vibrational states within each orbital. \textcopyright{} 1996 The American Physical Society.