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Attenuated total Reflectance FTIR Sri R Swetha*, Bhavya Sri K., Benazir Bima Department of Pharmaceutical Analysis , Raja Bahadur Venkata Rama Reddy Women's College of Pharmacy, Hyderabad, India *siri.pharma86@gmail.com
Online published on 22 January, 2021. Abstract Attenuated total internal reflectance (ATR) is based on the phenomenon of total internal reflectance. In this and IR beam enters the ATR element (e.g. a diamond ATR crystal) at a particular angle corresponding to the critical angle between the ATR element and the sample. The beam then undergoes total internal reflection and this total internal reflection creates an evanescent wave that stretches above the ATR element into the sample where some of the evanescent wave is absorbed by the sample. Since the sample absorbance attenuate the intensity of totally reflected infrared beam the term ATR is used. It sometimes becomes unavoidable to measure the absorption spectra of material that cannot be put inside a infrared cell such as paint on a door/wall or a piece of art, these type of samples can therefore be analyzed by using a ATR. This system is an attachment that can be added to a conventional IR system and is used only in sampling. Top Keywords Attenuated total reflectance, Total internal reflectance, Refraction, Diamond, Selenium. Top | |
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