ATR is one accessory to measure FTIR spectra. Mostly there are three types of accessories namely Transmission, ATR and specular reflectance. If you want to measure surface properties you can use this technique. This will have penetration depth of around 1 or 2 micrometers depending on your ATR crystal material.
actually ATR (Attenuated total reflection) is a unite used instead of preparation KBr disk part . It’s more efficient and give more accurate result , low signal to noise ratio . also small sample need to make analyzed, only 0.5-1 micron .
ATR is one accessory to measure FTIR spectra. Mostly there are three types of accessories namely Transmission, ATR and specular reflectance. If you want to measure surface properties you can use this technique. This will have penetration depth of around 1 or 2 micrometers depending on your ATR crystal material. I am attaching one ppt file for your reference which I have made to explain this technique to my students. In this file I have mentioned about sampling methods which will help you to understand.