He and H2 broadened propane cross sections in the 3 µm region at cold temperatures

Infrared absorption cross sections of pure propane, as well as propane broadened by He or H2, have been obtained from spectra recorded using Fourier transform instruments located at the Old Dominion University (ODU) and at the Canadian Light Source (CLS). Pressure and temperature regimes for He and H2 foreign gas broadening range from 10 Torr to 300 Torr between 298 K and 200 K. The integrated absorption cross sections were compared to reference data obtained from the Pacific Northwest National Laboratory (PNNL) spectroscopic database, with most values lying within ±10% of their expected values.