This paper was published as Journal de Physique IV, 1997, 7 (C2), pp. 151-152. It is available from http://jp4.journaldephysique.org/index.php?option=article&access=doi&doi=10.1051/jp4/1997146. Doi: 10.1051/jp4/1997146Metadata only entryThe amplitude reduction factor so2(k) is usually treated as an empirical parameter in EXAFS data analysis, although a few values have been calculated . We present here the results of a simple model calculation that gives accurate values of so2(k) for all absorption edges of all free atoms. The method is based on the use of Slater orbitals and the Sudden Approximation. We also calculate so2(k) using the Tight-Binding model in order to estimate any variation in the amplitude reduction with chemical environment. We find that so2(k) lies between 0.65 and 0.80 for all edges of use in EXAFS and has a characteristic dependence on atomic number. The calculated values are found to agree with a wide range of experimental data
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