Precise determination of Moessbauer lineshape parameters including interference [electronic resource].
- West Lafayette, Ind. : Purdue University. Dept. of Physics, 1987. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 12 : digital, PDF file
- Additional Creators:
- Purdue University. Department of Physics and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Using 100 Ci /sup 183/Ta and 5 Ci /sup 182/Ta sources, with LiF and NaCl crystal monochromating filters, we have measured the lineshape parameters for the 46.5 keV and 99.1 keV Moessbauer effect (ME) transitions of /sup 183/W and the 100.1 keV transition of /sup 182/W. Using an analytic representation of the convolution integral and utilizing asymptotic analyses of the lineshape, we find, for both transmission and microfoil internal conversion (MICE) experiments, accurate values of all ME parameters including width, position, cross section, and interference. This new approach allows deconvolution of source and absorber spectra and gives a simple analytic expression for both as well as their Fourier transforms. The line widths for the 46.5, 99.1, and 100.1 keV transitions are 3.10(10), 0.369(18), and 0.195(12) cm/s, respectively. The interference parameters are -0.00257(9), -0.0093(12), and -0.0107(12) in the same respective order. The agreement between transmission and MICE measurements for the above lineshape parameters is within the experimental errors. We believe these measurements are the first having sufficient precision to allow a quantitative comparison with dispersion theory and they indicate interference parameters 10 to 20% smaller than predicted. Our measured line widths are less than earlier reported values. This is because our analysis of the true lineshape and the study of line asymptotics permits a quantitative determination of the isomer lifetimes rather than the usual lower bound found in earlier ME experiments. 37 refs., 4 figs., 2 tabs.
- Published through SciTech Connect., 01/01/1987., "conf-870825-4", "DE88004821", International conference on the applications of the Mossbauer effect, Melbourne, Australia, 17 Aug 1987., and Cao, Y.; Crow, M.L.; Mullen, J.G.; Schupp, G.; Yelon, W.; Cowan, D.; Bullard, B.; Djedid, A.
- Funding Information:
- FG02-85ER45200 and FG02-85ER45199
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