Triply Differential Studies of Atomic and Molecular Photoionization Using Synchrotron Radiation. Final Report June 1, 1980 - September 30, 1985

摘要

Basic studies of photoionization processes in atoms and molecules have been carried out using triply differential (differential in incident wavelength, ejected electron energy, and ejection angle) photoelectron spectroscopy with synchrotron radiation as the excitation source. Measurements have been conducted in the vacuum ultraviolet wavelength range up to h(mu) approximately 35 eV on a variety of atomic and molecular systems. Photoelectron branching ratios (partial photoionization cross sections) and photoelectron angular distributions were obtained for all accessible states. Several novel physical effects were discovered including (a) shape-resonance-induced vibrational effects in molecular photoionization, (b) autoionization-induced-vibrational effects in molecular photoionization, (c) polarization of fluorescence following molecular photoionization, (d) photoelectron spectra of selected rare gas clusters, (e) continuum-continuum-coupling effects in photoionization of Nitrogen and Sulfur hexafluoride, etc. Triply differential photoionization data on a variety of atoms and molecules were produced. A second-generation, state-of-the-art triply differential photoelectron spectrometer was developed and put into operation.