Dear Prashant,

UV DRS can be used to measure the optical absorption in powder material. Hence it can be used to define the absorption edge and consequently the energy band pf the material.

For more details please follow the research gate LINK:https://www.researchgate.net/post/Is_there_any_difference_between_UV-VIS_and_UV-DRS_or_both_studies_are_same

Best wishes

Respected sir

Abdelhalim_Zekry

Thanks and regards

Dear Prashant Koli , you can benefit from this link;

https://chemistry.stackexchange.com/questions/6091/what-is-the-principle-of-diffuse-reflectance-spectroscopy-behind-band-gap-measur

and http://mmrc.caltech.edu/FTIR/Literature/Diff%20Refectance/Diffuse%20Reflectants%20Spec%20%20J.%20Blitz.pdf

I think these are so useful.