Wavelength dependent photoelectron spectra of rotationally resolved autoionizing levels of nitric oxide

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Abstract
Photoelectron spectra obtained following two photon excitation to rotational levels of the 9dσπ, v=2 state, which can autoionize into the NO+ v+=0 and 1 continua, are presented. The photoelectron spectra obtained along the laser polarization axis show a distinct wavelength dependence across the rotationally resolved autoionizing resonances; the angular distributions vary dramatically, becoming more isotropic on resonance. The branching ratio into the NO+ v+=1 state increases significantly on the resonance, in accord with the Δv=−1 propensity rule for vibrational autoionization.