ATR FTIR Attenuated total reflection (ATR) Fourier transform infrared spectroscopy (FTIR spectroscopy)

Attenuated total reflection (ATR) is a sampling technique used alongside traditional infrared spectroscopy, which ultimately qualifies samples to be observed directly in an either solid or liquid state, without additional preparation. FTIR stands for ‘Fourier-transform infrared’ spectroscopy: a technique that can be used to procure an infrared spectrum of either the emission or absorption of a liquid, solid, or gas sample.