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- W2094865391 abstract "The electron spectrum arising from internal conversion in 169Tm has been examined as a function of the chemical environment. The 169Er ions were imbedded after passage through an isotope separator into a variety of targets including tungsten metal, WO3 and Tm2O3. The electron spectra were measured with a double-focussing electron spectrometer. The relative intensities of the converted electrons with the exception of the outermost PI shell were insensitive to the chemical media. The analysis gave MI 100, MII 37 ±1, RmIII 38±1, MV 0.9 ± 0.2, MV 1.0±0.2, NI 22.1±0.6, NII 6.4±0.3, NIII 7.6±0.2, NIV,V 0.20±0.02, OI 3.7±0.1, OII, III 2.08±0.06. This is in agreement with theory based on an M1 transition with 0.108% E2 admixture. The intensity of the PI shell, however, was found to be dependent on the chemical surroundings. The ratio of PI/OI intensities were 0.056±0.007, 0.035±0.006, and 0.030±0.006, respectively, for W, Tm2O3 and WO3. This indicates that the PI conversion in the oxides is 38% (Tm2O3) and 46% (WO3) lower than in the metal. The internal conversion coefficients were compared with electron densities obtained from relativistic wave functions for Tm and Tm ions. From this comparison, it was possible to estimate the changes in electron densities at the nucleus. A discussion is made of the importance of these electron density measurements in evaluating Mössbauer isomer shifts. The transition energy is found to be 8.401±0.008 keV." @default.
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- W2094865391 date "1968-04-01" @default.
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- W2094865391 title "Dependence of internal conversion in 169Tm on the chemical environment and its application to the Mössbauer isomer shift" @default.
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- W2094865391 doi "https://doi.org/10.1016/0375-9474(68)90131-0" @default.
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