Nondipole effects in photoemission angular distribution excited by high-energy X-rays

Takashi Fujikawa, Rie Suzuki, Hiroko Arai, Hiroshi Shinotsuka, L. Kövér

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Angular distribution of emitted photoelectrons is theoretically studied for high-energy X-rays where electric quadrupole and magnetic dipole transitions play some important roles in addition to the electric dipole transitions. We apply irreducible tensor expansion of photon field to discuss the high-energy photoelectron angular distribution instead of the usual power series expansion. The present numerical calculations show that the conventional power series expansion works so well up to quite high energy (≈10 keV) for core excitation. Photoelectron diffraction effects make the nondipole contribution sensitive to the geometrical setup of surrounding scattering atoms because of the strong focusing effect in the high-energy region. Total high-energy photoemission intensities from extended levels are well described by use of the Gelius formula because the interference terms are effectively smeared out by Debye-Waller factors.

Original languageEnglish
Pages (from-to)14-23
Number of pages10
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume159
Issue number1-3
DOIs
Publication statusPublished - Jun 2007

Fingerprint

Angular distribution
Photoemission
Photoelectrons
photoelectric emission
angular distribution
X rays
photoelectrons
power series
series expansion
x rays
Tensors
energy
Photons
Diffraction
Scattering
Atoms
magnetic dipoles
electric dipoles
quadrupoles
tensors

Keywords

  • Debye-Waller factor
  • Gelius formula
  • High-energy XPS
  • Irreducible tensor
  • Nondipole excitation
  • Photoelectron diffraction

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Nondipole effects in photoemission angular distribution excited by high-energy X-rays. / Fujikawa, Takashi; Suzuki, Rie; Arai, Hiroko; Shinotsuka, Hiroshi; Kövér, L.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 159, No. 1-3, 06.2007, p. 14-23.

Research output: Contribution to journalArticle

Fujikawa, Takashi ; Suzuki, Rie ; Arai, Hiroko ; Shinotsuka, Hiroshi ; Kövér, L. / Nondipole effects in photoemission angular distribution excited by high-energy X-rays. In: Journal of Electron Spectroscopy and Related Phenomena. 2007 ; Vol. 159, No. 1-3. pp. 14-23.
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