Dear Jose,

please use the XCOM data base.

https://www.nist.gov/pml/xcom-photon-cross-sections-database

From point 7. (ASCII output for text-based browser) you can set up your x-ray attenuation data even for organic material; you only have to input the chemical formula.

From point 8. (Download Your Own Copy of XCOM Version 3.1) you may download a private copy of that program.

Please note that the photon energy is in MeV and a decimal 'dot' is used instead of a comma.

Therefore when copying the data into your evaluation/display program you may convert the 'dot' into 'comma' in order to get the right order of magnitude.

Good luck.

Dear Dr. Gerhard,

Many thanks. This will help a lot.

Kind regards,

José.

If you mean a database containing reference spectra so you can compare the white line and shape of your XANES to known compounds. There are several, listed on: http://xafs.org/Databases under Reference data. For the edge energy of each element as what I noticed can be done in the link that Gerhard Martens sent, I generally use Hephaestus from the Demeter software package written by Bruce Ravel.

Within Hephaestus you can check the edge energy of all elements and also the the fluorescence lines as a result from the excitation. You can also check which elements have adsorption edges or fluorescence lines at which energy. And there is a very limited amount of reference spectra in the software too.

This software package will be useful later on too when you are going to start performing background subtraction and fitting the of the XANES (Athena) and fitting of the EXAFS (Artemis) spectra you're going to collect.