CÁC BÀI BÁO KHOA HỌC 16:37:07 Ngày 16/06/2019 GMT+7
Pressure effects in DebyeWaller factors and in EXAFS

Anharmonic correlated Einstein model (ACEM) and statistical moment method (SMM) have been developed to derive analytical expressions for pressure dependence of the lattice bond length, effective spring constant, correlated Einstein frequency and temperature, DebyeWaller factors (DWF) or second cumulant, first and third cumulants in Extended X-ray Absorption Fine Structure (EXAFS) at a given temperature. Numerical results for pressure-dependent DWF of Kr and Cu agree well with experiment and other theoretical values. Simulated EXAFS of Cu and its Fourier transform magnitude using our calculated pressure-induced change in the 1st shell are found to be in a reasonable agreement with those using X-ray diffraction (XRD) experimental results. © 2010 Elsevier B.V. All rights reserved.

 Van Hung N., Hung V.V., Hieu H.K., Frahm R.R.
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  Từ khóa : Analytical expressions; Anharmonic; Cumulants; Debye Waller factor; EXAFS; Extended X-ray absorption fine structures; Lattice bonds; Numerical results; Pressure dependence; Pressure dependence effects; Spring constants; Statistical moments; Theoretical values; Bond length; Fourier transforms; Krypton; X ray diffraction; Pressure effects