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Phys. Rev. Lett. 81, 1596–1599 (1998)

Manifestations of Nonlocal Exchange, Correlation, and Dynamic Effects in X-Ray Scattering

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M. Jung, R. W. Dunford, D. S. Gemmell, E. P. Kanter, B. Krässig, T. W. LeBrun, S. H. Southworth, and L. Young
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

J. P. J. Carney, L. LaJohn, and R. H. Pratt
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260

P. M. Bergstrom, Jr.
N Division, Lawrence Livermore National Laboratory, Livermore, California 94551

Received 13 April 1998; published in the issue dated 24 August 1998

We report precise measurements of differential x-ray scattering cross sections in Ne and He from 11–22 keV and develop a method for obtaining predictions of comparable accuracy ( 1%). The measurement of ratios (total scattering in Ne to He and Compton to Rayleigh scattering in Ne) facilitates comparison to theories. We find evidence for the need to include nonlocal exchange, electron correlation, and dynamic effects for an accurate description at low Z and conclude that no single current theory is sufficient.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1596
DOI:
10.1103/PhysRevLett.81.1596
PACS:
32.80.Cy, 07.85.-m
 
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