ASTROPHYSICAL EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE ANALYSIS

We present an astrophysical extended X-ray absorption fine-structure ( EXAFS) analysis (AEA) tool. The AEA tool is designed to generate a num erical model of the modification to the X-ray absorption coefficient d ue to the EXAFS phenomenon. We have constructed a complete database (e lements up to the atomic number 92) of EXAFS parameters: central atom phase shift (2 delta(1)), backscattering phase shift (phi(b)), and bac kscattering amplitude (F). Using the EXAFS parameter data base, the AE A tool can generate a numerical model of any compound when the atomic numbers of neighboring atoms and their distances to the central X-ray- absorbing atom are given.