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Phys. Rev. A 60, R2641–R2644 (1999)

Validity of the independent-particle approximation in x-ray photoemission: The exception, not the rule

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D. L. Hansen1, O. Hemmers1, H. Wang1, D. W. Lindle1, P. Focke2, I. A. Sellin2, C. Heske3, H. S. Chakraborty4, P. C. Deshmukh4, and S. T. Manson5
1Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003
2Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200
3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
4Department of Physics, Indian Institute of Technology-Madras, Chennai 600036, India
5Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303-3083

Received 22 January 1999; published in the issue dated October 1999

A combined experimental and theoretical study of argon valence photoionization illustrates the discovery of the broad lack of validity of the independent-particle approximation (IPA) for x-ray photoemission. In addition to previously known breakdowns of the IPA, which are limited to high photon energies and regions very near threshold, the observed breakdown in photoionization at intermediate energies demonstrates generally that the IPA is valid only in very restricted domains. These restrictions are expected to be relevant throughout the periodic table, with consequences for a wide variety of applications.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.60.R2641
DOI:
10.1103/PhysRevA.60.R2641
PACS:
32.80.Fb, 32.80.Dz
 
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