Ion Distributions for Resonance-Enhanced Multiphoton Ionization of ClO

Results of theoretical studies of rotationally resolved photoelectron spectra for (2 + 1') resonance enhanced multiphoton ionization (REMPI) of the C ^2Σ^-, D ^2Σ^-, E ^2Σ^-, and F ^2Σ^- Rydberg states of ClO are presented. Cooper minima are predicted to occur in the electronic continua for photoionization of the D and F states and lead to unusual behavior in the ion rotational distributions. Strong partial wave I mixing is also predicted in the continua for the C and E states due to the nonspherical molecular ion potentials. These Cooper minima and l mixing make the associated photoionization dynamics quite nonatomiclike.