HIGH-RESOLUTION ABSORPTION-COEFFICIENTS FOR FREON-12

Ultra high resolution absoprtion coefficients of the Q‐branch of Freon‐12 (CCℓ2F2) have been obtained using tunable diode laser spectroscopy. Continuous spectra are presented from 1155 cm−1 to 1163 cm−1 with a spectral resolution ∼ .001 cm−1. Absolute wavelength calibration was obtained using SO2 spectra as a standard and a 5 cm Ge etalon for relative calibration between SO2 lines. The relative accuracy of the Freon‐12 line positions was ∼ .0005 cm−1. The Freon‐12 dataobtained at a pressure of .05 Torrexhibited a rich and highly structured spectra. Howeverwith the exception of three isolated features at 1158.21159and 1161 cm−1 collisional broadening reduces the spectra to a structureless continuum for nitrogen pressures greater than 20 Torr. The spectra at 1161 cm−1 continue to exhibit structure at atmospheric pressure. This paper is not subject to U.S. copyright.