Fe-57 Mössbauer spectra for extremely thin surface layers (600–3000 Å) were obtained by detecting internal conversion electrons emitted after resonant absorption. The sample was placed inside a proportional counter specifically designed for Mössbauer backscattering measurements. Helium-10% methane flowgas was used to detect the conversion electrons. It is estimated from the observed spectra that this technique can be used to obtain Mössbauer backscattering spectra for iron-containing surface layers 50–3000-Å thick. Backscattering spectra for thicker surface layers (0.2–0.5 mil) were obtained by merely changing to an argon-10% methane flow-gas mixture and counting the 6.3-keV internal conversion x rays rather than conversion electrons.

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crystal, being influenced by the stress field due to the existing imperfections. It seems to be already certain that the observed boundary has a magnetic origin. However, in order to get more direct proof, further experiments such as an attempt to find any field effect will be made.The 57 Fe 14.4-keV~level electric-quadrupole coupling in a-Fe has been detected by Mossbauer spectroscopy.

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