Ultrafast band-structure variations induced by fast Au ions in BeO
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Auger-electron spectra associated with Be atoms in the pure metal lattice and in an oxide have been investigated for 1.8 MeV/u Au-129(41+) ions and 2.7 keV primary electrons. The excitation and local energy transfer by such fast primary particles in solids is dominated by electronic processes. The electron-induced spectrum is compared to calculated band-structure results and it is relatively well understood. For the heavy-ion case, however, we observe a significant variation of the Auger electron spectrum, related to a variation of the electronic band structure. This spectrum points to a formation of a metal-like meta-stable electronic density of states. (c) 2010 Elsevier B.V. All rights reserved.
Keywords:Auger-electron emission / Ion-track formation / High electronic excitation density / Short-time electron dynamics / Band-structure variation / Wide-gap insulator / Melting
Source:Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 2011, 269, 9, 959-963
- Alexander von Humboldt Foundation, CNPq, CAPES