Core-hole effects in the x-ray-absorption spectra of transition-metal silicides

Abstract

Core-hole effects in the x-ray-absorption spectra of transition-metal silicides

Practical aspects of running the WIEN2k code for electron spectroscopy

“…Different methods have been employed to obtain the broadening factor G x ðEÞ: Müller and Wilkins (1984) used values derived from experimentally determined mean free path lðEÞ. Weijs et al (1990) used an empirical linear function of energy E: G x ðEÞ ¼ 0:1E, E being the energy above threshold which gives good results when compared to the experiment. Recently Muller et al (1998) proposed a theoretical formula (which is valid only in the vicinity of E F ) using the random phase approximation (RPA) (Pines and Nozières, 1998).…”

2p X-ray absorption of titanium in minerals

“…To calculate the spectral function it is thus necessary to find the initial and final state energies and wave functions. A central criterion for treatment of this problem for a specific X-ray absorption edge is the influence of the core hole on the final state wave functions (Weijs et al 1990). For the metal K edge the 1 s core hole does not usually dominate the spectral shape, although its attractive potential can distort the spectra.…”

Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

“…In particular for Co, the shift is a consequence of the itinerant bands that dominate the unoccupied majority Co states at the Fermi energy (see Figures 3 and 4). The transition energy for interaction of the core hole in the final state with localized 3d states is lower compared to the itinerant states because the latter screen the core hole to some extent [60,61]. This effect produces an energy shift between itinerant and localized states.…”