Plasmon losses in core-level photoemission spectra studied by the quantum Landau formula including full multiple scattering

Theoretical study of plasmon losses from Li 1s level in core‐level photoemission spectra

“… Kazama et al have investigated the Al 2s and Na 2s single‐plasmon losses without elastic scatterings, with single scatterings, and with full multiple scatterings. Depth profiles of single‐loss spectra of Na 2s photoelectrons calculated with full multiple scatterings decay faster than without elastic scatterings. Figure shows the difference between the depth profiles of the Li 1s and Na 2s single‐loss intensities calculated with full multiple scatterings.…”

“…This behavior can be due to defocusing effect: it has been suggested on the basis of multiple‐scattering calculation that if several atoms are linearly arranged along the emission direction, the destructive interference actually reduces the intensity. Kazama et al have investigated the Al 2s and Na 2s single‐plasmon losses without elastic scatterings, with single scatterings, and with full multiple scatterings. Depth profiles of single‐loss spectra of Na 2s photoelectrons calculated with full multiple scatterings decay faster than without elastic scatterings.…”

Depth profiling of noble gas atoms implanted in Al matrix: A photoelectron energy loss spectroscopy study

“…In a crystalline solid, the photoelectron flux may be increased along dense atomic rows (focusing) due to many-body coherent elastic scattering; however this forward focusing effect is lost beyond a few atomic distances (defocusing) [47,48]. In the Al(001) matrix, this photoelectron diffraction mechanism modulates the relative intensity of plasmon excitation peak relative to the no-loss Al 2p peak, on the order of 10-20 % (e.g.…”

Multiscale approach for modeling electron spectra induced by photons from solids

“…Developments in theory of X‐ray induced photoemission from solids focusing on QED models are discussed in a recent review of Fujikawa . This QED approach describes the intensity of the no‐loss XPS peaks, the photoelectron diffraction phenomena in the case of the high‐energy photoemission, while for the energy loss part of the spectra, the quantum Landau theory developed by Fujikawa explains fully the effects of multiple intrinsic and extrinsic plasmon excitations (with effects of multiple elastic electron scattering preceding or following energy losses) in the bulk or at the surface and provides a good description for high kinetic energy photoelectrons, down to ~100 eV kinetic energy (as shown recently for the case of Al, Na, and Li core‐level photoelectrons induced from single crystals) . A different ‘one step’ model describes the angle‐resolved photoelectron spectra even in the case from magnetic materials, accounting for effects of electron correlations as well …”