GRAZING-INCIDENCE MOSSBAUER-SPECTROSCOPY - NEW METHOD FOR SURFACE-LAYERS ANALYSIS .2. THEORY OF GRAZING-INCIDENCE MOSSBAUER-SPECTRA

A general theory of grazing incidence Mossbauer spectroscopy (GIMS) sp ectra for an inhomogeneous layered medium is presented. The computer s imulation based on this theory shows that the shape of the resonant sp ectrum of the reflected wave intensity, in the case of a resonant film , differs considerably from the case of a semiinfinite resonant mirror . This shape strongly depends on the thickness and the properties of t he film and of the nonresonant substrate. The proposed theory of the l ineshape of Mossbauer secondary radiation spectra from resonant films takes into account the influence of different types of photo- and conv ersion electrons on the resulting spectrum. It is shown that the fitti ng of grazing incidence Mossbauer spectra can be done only by means of numerical simulations.