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Thermo Fisher Scientific

Multiple Reflection versus Single Reflection ATR Accessories


Attenuated total reflectance (ATR) is an ideal technique to study the surface phenomena of a large variety of samples. A number of differentATR accessories are available today. Most are affordable, canaccommodate a variety of skill levels, and can analyze samples withdifferent sizes, morphologies, and chemical states. To narrow the choice ofaccessories, one of the first questions asked should be “do I need amultiple reflection crystal", as in the Baseline Horizontal ATR (HATR), or“do I need a single reflection crystal" as in the Single Bounce accessory?To correctly answer that question, a number of factors must be consid-ered: the volume, area, hardness, pH and the infrared absorbance of the sample.


  • FT-IR
  • ATR