Electric-Octupole and Pure-Electric-Quadrupole Effects in Soft-X-Ray Photoemission
Andrei DereviankoDepartment of Physics, University of Notre Dame, Notre Dame, Indiana 46556O. HemmersDepartment of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003S. ObladDepartment of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003P. GlansAtomic Physics, Stockholm University, 10405 Stockholm, SwedenHelen WangDepartment of Physics, Uppsala University, Box 530, S-751 21 Uppsala, SwedenS. B. WhitfieldDepartment of Physics, University of Wisconsin, Eau Claire, Wisconsin 54702R. WehlitzSynchrotron Radiation Center, University of Wisconsin, Stoughton, Wisconsin 53589I. A. SellinDepartment of Physics, University of Tennessee, Knoxville, Tennessee 37996W. R. JohnsonDepartment of Physics, University of Notre Dame, Notre Dame, Indiana 46556D. W. LindleDepartment of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003
2000en
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Annotatsiya
Second-order [ O(k(2)), k = omega/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.
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