Study of threshold energy [formula omitted] in EXAFS.

This work demonstrates that the threshold energy E 0 can be obtained from a simple tentative rule and the bond length R can be obtained correctly by running the FIT program while fixing E 0. The extended X-ray absorption fine structure (EXAFS) spectra for C u , W , and A u metal foils are tested and for the anharmonic system, the experimental C u spectra measured at temperatures of 50, 150, 295, 400, 500, 600 and 700 K. From the tests, it is confirmed that a more precise bond length R comparable to the crystallographic data can be obtained for both cases. Moreover, it is deduced that the new running mode of the conventional EXAFS FIT program yields satisfactory results for the anharmonic system. • Extended X-ray Absorption Fine Structure. • Setting threshold energy in EXAFS. • Study of anharmonic vibrational system. [ABSTRACT FROM AUTHOR]