Abstract
Low-energy electron reflection (LEER) and transmission (LEET) spectra have been recorded in the range 1–16 eV for argon films grown on polycrystalline platinum. The data are compared with low-energy electron diffraction (LEED) calculations of the elastic reflection and transmission of an electron beam incident on the (111) surface of a semi-infinite Ar solid azimuthally disordered. Structures in LEER spectra reflect essentially the band structure characteristics of the Ar(111) surface, whereas in transmission, similar structures are strongly modified by scattering from phonons, defects and imperfections of the film as evidenced by changes in LEET spectral line shapes as a function of incidence angle and film thickness. These findings are discussed in relation with the ability of the LEED formalism to describe elastic or quasi-elastic scattering from partially disordered films at very low energies.
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