Studies of photoionization dynamics of methylidyne, imidogen, and hydroxyl radicals at near-threshold photoelectron kinetic energies

We discuss results of theoretical studies of rotationally resolved photoelectron spectra of the CH, NH, and OH radicals, including predictions of zero-kinetic-energy (ZEKE) spectra for molecular ions produced via resonance enhanced multiphoton ionization. The influence of dynamical features such as Cooper minima, orbital evolution, and 1 mixing are examined for photoionization of the 3σ Rydberg orbital in these radicals. We also make specific predictions for the photoelectron spectra for each molecule within the context of current experimental capabilities