Infrared absorption cross sections for 1,1,1,2-tetrafluoroethane

- 1,1,1,2-Tetrafluoroethane (HFC-134a) infrared absorption cross sections have been determined from 750 to 1600 cm−1.
- They cover temperatures from 191 to 296 K and appropriate atmospheric pressures.
- These will allow the quantification of HFC-134a abundances from IR remote-sensing measurements.

High-resolution infrared absorption cross sections for 1,1,1,2-tetrafluoroethane have been determined over the spectral range 750-1600 cm−1 from spectra recorded using a high-resolution FTIR spectrometer (Bruker IFS 125HR) and a 26-cm-pathlength cell. Spectra of 1,1,1,2-tetrafluoroethane/dry synthetic air mixtures were recorded at 0.015 cm−1 resolution (calculated as 0.9/MOPD) at a number of temperatures and pressures (22-761 Torr and 191-296 K) appropriate for atmospheric conditions. Intensities were calibrated using composite 1,1,1,2-tetrafluoroethane spectra taken from the Pacific Northwest National Laboratory (PNNL) IR database. This cross section dataset is intended to replace what is currently available in the HITRAN/GEISA databases.