Circular dichroism in photoemission from surfaces
1991; Elsevier BV; Volume: 251-252; Linguagem: Inglês
10.1016/0039-6028(91)90967-w
ISSN1879-2758
AutoresG. Schönhense, C. Westphal, Joachim Bansmann, M. Getzlaff, J. Noffke, L. Fritsche,
Tópico(s)Electron and X-Ray Spectroscopy Techniques
ResumoIn angle-resolved photoelectron spectroscopy with circularly polarized radiation, the photoemission intensities depend on photon helicity. This phenomenon arises for pure electric dipole transitions and nonchiral species provided the target exhibits a spatial orientation (or alignment) and the experimental geometry defines a "handedness". The new type of spectroscopy is illustrated by the examples of photoemission from graphite (0001) and Pd(111) surfaces. It is evident that the effect does not result from the spin-orbit interaction in contrast to the electron spin-polarization phenomena. The measured asymmetries in a direct interband transition depend sensitively on hybridization of the initial or final band states.
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