title: Valence band circular dichroism in non-magnetic Ag/Ru(0001) at normal emission.
abstract: For the non-magnetic system of Ag films on Ru(0001), we have measured the circular dichroism of photoelectrons emitted along the surface normal, the geometry typically used in photoemission electron microscopy. Photoemission spectra were acquired from micrometer-sized regions having uniformly thick Ag films on a single, atomically flat Ru terrace. For a single Ag layer, we find a circular dichroism that exceeds 6% at the d-derived band region around 4.5 eV binding energy. The dichroism decreases as the Ag film thickness increases to three atomic layers. We discuss the origin of the circular dichroism in terms of the symmetry lowering that can occur even in normal emission.
authors: Departamento Física de Materiales, Universidad Complutense de Madrid, Madrid 28040, Spain.
authors: Arantzazu
authors: A
authors: Mascaraque
authors: T
authors: T
authors: Onur Menteş
authors: Kevin F
authors: KF
authors: McCarty
authors: Jose F
authors: JF
authors: Marco
authors: Andreas K
authors: AK
authors: Schmid
authors: Andrea
authors: A
authors: Locatelli
authors: Juan
authors: J
authors: de la Figuera
mesh_terms: D002627:Chemistry, Physical / Q000379:methods*; D002942:Circular Dichroism; D004583:Electrons; D010777:Photochemistry / Q000379:methods*; D056951:Photoelectron Spectroscopy / Q000379:methods; D012428:Ruthenium / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013499:Surface Properties; D014961:X-Ray Diffraction; D014965:X-Rays
chemical_list: D012834:Silver; D012428:Ruthenium