Attenuated total reflection spectroscopy in which the infrared absorption spectrum of a sample in contact with a prism is measured.
Notes: - Most ATRIR work is carried out with an angle of incidence of \(\pu{45\!^{\circ}}\) inside a \(\ce{ZnSe}\) or diamond prism, both with a refractive index of 2.4. With such optical conditions, total internal reflection is achieved with an effective sample refractive index less than about 1.7 for almost all powdered samples.
- ATRIRS has particular application in the surface chemical analysis of solid particle films immersed in aqueous solution.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1789 (https://doi.org/10.1515/pac-2019-0404)