Multi-atom resonant photoemission

Fadley, Charles S.; Arenholz, Elke; Kay, Alex W.; Garcia de Abajo, Javier; Mun, Bongjin S.; Yang, See-Hun; Hussain, Zahid; Van Hove, Michel
February 2000
AIP Conference Proceedings;2000, Vol. 506 Issue 1, p251
Academic Journal
We report here on the first measurements and theoretical considerations of an interatomic multi-atom resonant photoemission (MARPE) effect that can enhance photoelectron intensities by as much as 100% and appears to be generally observable in solid materials. MARPE occurs when the photon energy is tuned to a core-level absorption edge of an atom neighboring the atom from which the photoelectron is being emitted, with the emitting level having a lower binding energy than the resonant level. Large peak intensity enhancements of 30–100% and energy-integrated effects of 10–30% have been seen by our group in various metal oxides and in a metallic system, as well as by other groups now in metal halides and an adsorbate system. The effect has also been observed in solids via the secondary decay processes of Auger emission and fluorescent x-ray emission. Weaker effects also appear to be present in gas-phase electron emission experiments. The range of the effect is so far estimated from both experiment and theory to be about 2–3 nm, with further work needed on this aspect. MARPE should thus provide a new and broadly applicable spectroscopic probe of matter in which the atomic identities and other properties (e.g. magnetic order) of atoms neighboring a given atomic type should be directly derivable. Such interatomic resonance effects also may influence normal x-ray absorption experiments, and in some cases, they may require a consideration of the degree of x-ray beam coherence for their quantitative analysis. © 2000 American Institute of Physics.


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