Thermal infrared absorption cross-sections of CCl 4 needed for atmospheric remote sensing

Abstract

Highly accurate spectral absorption cross-sections k ν ( cm 2 molecule −1 ) were measured in the 12.7 μm band of CCl 4 at temperatures between 208 and 296 K and pressures between 10 and 1013 mb with a high-resolution Fourier-transform spectrometer. Our data were obtained at pressures p and temperatures T that characterize the atmospheric layers in the commonly adapted models of the atmosphere. The selected ( p, T) combinations also represent tangent heights in solar-occultation-type remote sensing observations and actual conditions recorded by balloon-borne instruments in the Arctic. The combined absolute intensity (or integrated cross-section) of the bands contributing to the absorption around 12.7 μm is 6.295±0.102×10 −17 cm molecule −1 .