Kinetic-energy- and angular-resolved fragmentation of CO in vibrational-resolved C 1sexcitation

Angular distributions of ${\mathrm{C}}^{+}$+${\mathrm{O}}^{+}$ from CO were measured, following vibrationally resolved C 1s excitations into the 2pπ, 3sσ, and 3pπ 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 (β) of ${\mathrm{C}}^{+}$+${\mathrm{O}}^{+}$ approach their theoretically expected values as the released kinetic energy in the fragmentation increases. The value of the β parameters remains constant for all vibrational states within each orbital. © 1996 The American Physical Society.