An estimation of the optical constants of copper based on the FEFF 9 package: an update of previous results
The FEFF software package is based on a first-principles real space Green function (RSMS) scattering theory to calculate x-ray absorption fine-structure (XAFS) and forward scattering amplitudes (FSA). A procedure to obtain XAFS and FSA using FEFF version 9 is described and applied to crystalline met...
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| Μορφή: | Artículo |
| Γλώσσα: | en_US |
| Έκδοση: |
2021
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| Θέματα: | |
| Διαθέσιμο Online: | http: / /doi .org/1 0.15174/au.2021.2933 https://www.actauniversitaria.ugto.mx/index.php/acta/article/view/3215 |
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| Περίληψη: | The FEFF software package is based on a first-principles real space Green function (RSMS) scattering theory to calculate x-ray absorption fine-structure (XAFS) and forward scattering amplitudes (FSA). A procedure to obtain XAFS and FSA using FEFF version 9 is described and applied to crystalline metallic copper as an example. From this, an energy-dependent complex dielectric constant is calculated, from which other optical constants such as the complex index of refraction, absorption coefficient, reflectance, and energy-loss function are derived. The results are compared to values taken from the literature. It is found that they agree in the x-ray region; however, for photons corresponding to the ultraviolet (below 120 eV), the agreement is only qualitative. |
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