attenuated total reflectance infrared spectroscopy attenuated total reflectance Fourier transform infrared spectroscopy ATR FT-IR spectroscopy CHMO:0000763 attenuated total reflectance Fourier transform infra-red spectroscopy attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy Fourier transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy Fourier transform attenuated total reflectance infra-red spectroscopy Fourier transform attenuated total reflectance infrared Fourier transform attenuated total reflectance infrared spectroscopy FTIR-ATR Fourier transform attenuated total reflectance infra-red Fourier transform infrared attenuated total reflection (FTIR-ATR) spectroscopy Fourier transform infrared attenuated total reflectance spectroscopy ATR-FTIR spectroscopy Spectroscopy where infrared light is introduced into a prism at an angle exceeding the critical angle for internal reflection. This produces an evanescent wave at the reflecting surface (a surface which is transparent to infrared such as thallium bromide) on which the sample is supported. The distortion of the evanescent wave by the sample is measured producing a spectrum which is then subject to a Fourier transform. ATR FTIR spectroscopy ATR-FTIR