Attenuation lengths of low-energy electrons in solids

Performing PES at low photon energy, we give and estimation of the effective attenuation length (EAL) for low-energy electrons in CoO and Yb, establishing a moderate increase of the EAL upon electron energy decrease.


  Offi et al., Phys. Rev. B 77, 201101(R) (2008) ;      J. Phys.: Condens. Matter 22, 305002 (2010).

The effective attenuation length (EAL) of low-energy electrons in a small-gap insulator (CoO) and in a rare earth film (Yb) is investigated by photoemission spectroscopy experiments (5<hv<21 eV). In both cases the EAL is found to increase when lowering the electron energy, but the experimental values are smaller than expected from the predictive formula, i.e. the so-called “universal curve”. We point out that the bulk sensitivity in low-energy photoemission (LEPES) may be lower than the expectation and it may strongly depend on the investigated material, with the further warning that theoretical efforts have to be undertaken for a clear interpretation of the photon energy dependence of the LEPES spectra.

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The attenuation length of low energy electrons in Yb
F. Offi, S. Iacobucci, L. Petaccia, S. Gorovikov, P. Vilmercati, A. Rizzo, A. Ruocco, A. Goldoni, G. Stefani, and G. Panaccione,
J. Phys.: Condens. Matter 22, 305002 (2010).
doi: 10.1088/0953-8984/22/30/305002

Attenuation lengths of low-energy electrons in solids: The case of CoO
F. Offi, S. Iacobucci, P. Vilmercati, A. Rizzo, A. Goldoni, M. Sacchi, and G. Panaccione,
Phys. Rev. B 77, 201101(R) (2008).
doi: 10.1103/PhysRevB.77.201101
Last Updated on Monday, 30 January 2017 13:07