The cumulant expansion of the EXAFS Debye-Waller factor is discussed for the polarized and nonpolarized K EXAFS formulae. The improved formula for the nonpolarized Irs turns out to give a shorter near-neighbour distance than the value obtained by the expansion derived previously. Specifically, in CuBr at around 600 K its difference is about 0.01 AA.
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T. Ishii (1992) studied this question.
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