V. A. Shamin*, A. Kh. Kadikova**, and Yu. V. Rats*
* Physicotechnical Institute, Ural Division, Russian Academy of Sciences, ul. Kirova 132, Izhevsk, 426001 Russia
** Udmurt State University, Krasnoarmeiskaya 71, Izhevsk, 426034 Russia
Received November 14, 1996
Abstract—Extended electron-energy-loss fine structure (EELFS) spectra near the Al K and Ag M4,5 absorption
edges were measured for 20-Å thick Al and 14- or 25-Å thick Ag surface layers. The phase function for the M4,5
absorption edge of Ag was evaluated from the experimental data. Atomic radial distribution functions were
determined using two methods: (1) Fourier transformation with correction for the phase shift and (2) regular-
ization method. The measured radii of the first coordination shells in aluminum and in silver (for the analyzing
depth of 25 Å) correspond well to the bulk values. The asymmetry of the coordination shell of silver observed
in the experiments with an analyzing depth of 14 Å is attributed to the increase of interatomic spacing in the
near-surface layers.
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