AIP Conference Proceedings
American Institute of Physics
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Over the past three decades, the dipole approximation has facilitated a basic understanding of the photoionization process in atoms and molecules. Advances in gas-phase photoemission experiments using synchrotron radiation have recently highlighted nondipole effects at relatively low photon energies while probing the limits of the dipole approximation. Breakdowns in this approximation are manifested primarily as deviations from dipolar angular distributions of photoelectrons. Detailed new results demonstrate nondipolar angular-distribution effects are easily observable in atomic gases at energies well below 1 keV, and, in molecules, a previously unexpected phenomenon greatly enhances the breakdown of the dipole approximation just above the core-level ionization threshold.
Atom-positron collisions; Dipole moments; Electron spectroscopy; Photoionization; Ultraviolet spectra
Atomic, Molecular and Optical Physics | Physical Chemistry
Copyright (2001) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Lindle, D. W.
Photoelectron Spectroscopy and the Dipole Approximation.
AIP Conference Proceedings, 576