Angular dependence, blackness and polarization effects in integral conversion electron Mössbauer spectroscopy

Sajti, Szilárd Mihály and Tanczikó, Ferenc and Deák, László and Nagy, Dénes Lajos and Bottyán, László (2015) Angular dependence, blackness and polarization effects in integral conversion electron Mössbauer spectroscopy. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 342. pp. 62-69. ISSN 0168-583X

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Abstract

Abstract General expressions of the electron yield in 57Fe integral conversion electron Mössbauer spectroscopy were derived depending on the glancing angle of the γ photons, on the source polarization and on the isotopic abundance of the source and the absorber (blackness effects) using an exponential escape function of the electrons originating from all Mössbauer-resonance-related processes. The present approach provides a firm theoretical basis to determine the alignment and direction of magnetization in the absorber. The intensity formulae were justified by least squares fits of α-57Fe spectral intensities measured in linearly and elliptically polarized source and absorber geometries. The fits reproduce the experimentally set angles with high accuracy. Limits of the current approach and its relation to other, less complete treatments in the literature are discussed.

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