# Is there a free online repository where I can download X-ray diffraction (XRD) data?

It's as the title of the question states. To be specific, I'm wondering if there are any free online repositories where I can download (.csv or .txt. or .xsl) files for x-ray diffraction (XRD) data.

• +1 but I had to change the title to match your question's body. You've probably seen this: mattermodeling.stackexchange.com/q/1/5. Also I think FTIR/UV-vis/etc. data is very different from XRD and warrants a separate question of its own. As for FTIR data, you simply want the energy transitions in a .txt file? Mar 17 at 19:22
• Yeah, I'm looking for a site or database (if such a thing exists) where I could get data or .txt files of (absorbance/transmittance vs. wavenumber) for different solutions or materials.
– jboy
Mar 17 at 19:44
• How about HITRAN? Mar 17 at 19:56
• @NikeDattani Oh swell, thanks!
– jboy
Mar 17 at 22:04
• I think it has nothing to do with XRD though, which is why I suggested a separate question about spectroscopic databases. Mar 17 at 22:12

You can also generate your own once you have a crystal structure, many tools exist to generate a diffraction pattern, for example pymatgen using the XRDCalculator, though these will need to be artificially broadened if you want something that looks like an experimental pattern.