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Phys. Rev. Lett. 84, 2116–2119 (2000)

Electric-Octupole and Pure-Electric-Quadrupole Effects in Soft-X-Ray Photoemission

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A. Derevianko1,*, O. Hemmers2, S. Oblad2, P. Glans3, H. Wang4, S. B. Whitfield5, R. Wehlitz6, I. A. Sellin7, W. R. Johnson1, and D. W. Lindle2
1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
2Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003
3Atomic Physics, Stockholm University, 10405 Stockholm, Sweden
4Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden
5Department of Physics, University of Wisconsin, Eau Claire, Wisconsin 54702
6Synchrotron Radiation Center, University of Wisconsin, Stoughton, Wisconsin 53589
7Department of Physics, University of Tennessee, Knoxville, Tennessee 37996

Received 11 August 1999; published in the issue dated 6 March 2000

Second-order [ O(k2), k = ω/c] nondipole effects in soft-x-ray photoemission are demonstrated via an experimental and a theoretical study of angular distributions of neon valence photoelectrons in the 100–1200 eV photon-energy range. A newly derived theoretical expression for nondipolar angular distributions characterizes the second-order effects using four new parameters with primary contributions from pure-quadrupole and octupole-dipole interference terms. Independent-particle calculations of these parameters account for a significant portion of the existing discrepancy between experiment and theory for Ne 2p first-order nondipole parameters.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2116
DOI:
10.1103/PhysRevLett.84.2116
PACS:
32.80.Fb, 31.25.Eb, 32.30.Rj

*Present address: ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138.

 
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