Seminars Archive
Thu 20 May, at 11:00 - Seminar Room T2
Multi-atom Resonant Photoemission: A Method for Determining Near-Neighbor Atomic Identities and Bonding
C.S.Fadley
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA & Department of Physics, University of California, Davis, CA 95616, USA
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA & Department of Physics, University of California, Davis, CA 95616, USA
Abstract
Measurements and theoretical calculations are reported for an interatomic multi-atom resonant photoemission (MARPE) effect that permits direct determination of near-neighbor atomic identities (atomic numbers). MARPE occurs when the photon energy is tuned to a core-level absorption edge of an atom neighboring the emitting atom, with the emitting level having a lower binding energy than the resonant level.
Large peak intensity enhancements of 33 to 105 percent and energy-integrated effects of 11 to 29 percent were seen in three metal oxides. MARPE should be sensitive to bond distance, bonding type, and magnetic order, and be observable via the secondary processes of x-ray fluorescence and Auger decay.
Last Updated on Tuesday, 24 April 2012 15:21
