Abstract
The effects of energy dependence of secondary radiation emission (SRE) followed by nuclear resonant and nonresonant photo-absorption at Mossbauer total external reflection (MTER) have been considered theoretically and checked experimentally. Numerical interpretation of a set of MTER and CEM spectra at different grazing angles has given the depth profiles of electronic density, photoabsorption coefficient and hyperfine interaction variations in 50 nm slightly oxidized57Fe film. Empirical functions of photo- and conversion electron yield are also determined. They appeared to be nonsimilar and nonmonotone. The energy dependencies of SRE are recalculated for time domain Mossbauer spectroscopy of synchrotron radiation (SR). The coherent nature of the TER effect reveals itself in the existence of delayed intensity of nonresonant SRE. The relation of nonresonant and resonant SRE, their energy, time and angular spectra strongly depend upon the depth of their creation, which opens a way for depth selective measurements as in the X-ray standing waves method.
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