LAUSR

Abstract We report high resolution ( δ ν ⩽ 0.001 cm - 1 ) Fourier Transform Infrared (FTIR) spectra of the trifluoromethane (fluoroform) isotopomer 13 CHF 3 including results from synchrotron based spectroscopy at the Swiss light source (SLS). The analysis is extended to the pure rotational spectra in the Terahertz (far-infrared) range (15–100 cm−1, δ ν FWHM = 0.0006 cm - 1 ), the ν 3 fundamental ( ν 0 = 695.292 cm - 1 ), the associated “hot” band 2 ν 3 - ν 3 providing information on the level 2 ν 3 ( ν 0 = 1389.807 cm - 1 ) and the ν 4 fundamental ( ν 0 = 1369.013 cm - 1 ) coupled to 2 ν 3 . The results are discussed in relation to the 13 C isotope effect on the vibrational quantum dynamics as derived by theory and in relation to fluoroform as a greenhouse gas.