Abstract
Conversion electron Mössbauer spectra of 73.0 keV γ-rays from iridium 193Ir were obtained at liquid helium temperature by detecting low-energy electrons emitted from the resonant iridium absorber with a channel electron multiplier. This new technique analyzes iridium within a depth of about 1 μm from the surface of materials, with a sensitivity several times greater than in conventional Mössbauer transmission measurements. A resonant effect of up to 10% has been observed for thin metallic iridium and IrO 2 films having natural isotopic composition.
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