Beyond the dipole approximation: Angular-distribution effects in the 1s photoemission from small molecules

Hemmers, O. A.; Wang, H.; Lindle, D. W.; Focke, P.; Sellin, I. A.; Mills, J. D.; Sheehy, J. A.; Langhoff, P. W.
February 2000
AIP Conference Proceedings;2000, Vol. 506 Issue 1, p222
Academic Journal
Over the past two decades, the dipole approximation has facilitated a basic understanding of the photoionization process in atoms and molecules. Recent experiments on the 1s inner shells of small molecules at relatively low photon energies (<=1000 eV) show strong nondipole effects. They are significant and measurable at energies close to threshold, in conflict with a common assumption that the dipole approximation is valid for photon energies below 1 keV. © 2000 American Institute of Physics.


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