Autoionization in N2O as measured by angle-resolved photoelectron spectroscopy

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Abstract
Angle-resolved photoelectron spectroscopy has been carried out on N2O as a function of photon energy from 13.5 to 20.5 eV using monochromatized synchrotron radiation. The purpose of these studies has been to investigate autoionization, and most of the data have been collected under conditions of constant ionic state. Six resonances are discussed in detail: the first four that form a portion of several Rydberg series leading to the A 2Σ+ ionic state and the first two window resonances leading to the C 2Σ+ state. Data have been taken as a function of the final state vibrational band and as a function of angle between the ejected photoelectron and polarization vector. In particular, the correlation between the integrated angular intensity and its angular distribution parameter, β, has been measured as a function of photon energy over the resonances. The nature of these results and importance to the understanding of autoionization in molecules is discussed.