Document Type

Conference Proceeding


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.


Atomic, Molecular and Optical Physics | Physical Chemistry


Presented at: The Sixteenth International Conference on the Application of Accelerators in Research and Industry (CAARI), Denton, TX, USA, November 1-4, 2000

Also published in:

Advanced Light Source Compendium of User Abstracts and Technical Reports 1993-1996, April 1997, p. 224


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.