TEMPERATURE-DEPENDENCE OF ULTRAVIOLET-ABSORPTION CROSS-SECTIONS OF ALTERNATIVE CHLOROFLUOROETHANES .2. THE 2-CHLORO-1,1,1,2-TETRAFLUORO ETHANE - HCFC-124

The temperature-dependent ultraviolet absorption cross-sections of CF3-CHFCl (HCFC-124) have been measured between 170 and 230 nm for temperatures ranging from 295 to 210 K, with uncertainties between 2 and 4%. These results are compared with other available sets of determinations. Temperature effects are discussed and the photodissociation coefficients, presented with their temperature dependence, are calculated. Implication of the temperature dependences on the stratospheric chemistry is also discussed. Parametrical formulae are proposed to compute absorption cross-section values for wavelengths and temperatures useful in modelling calculations.