Electric-octupole and pure-electric-quadrupole effects in soft-x-ray photoemission

Details Electric-octupole and pure-electric-quadrupole effects in soft-x-ray photoemission Electric-octupole and pure-electric-quadrupole effects in soft-x-ray photoemission

1999-08-18

arxiv.org/abs/physics/9908033v1

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.84.2116

Second-order [O(k^2), k=omega/c] nondipole effects in soft-x-ray photoemission are demonstrated via an experimental and 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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