CF3C(O)Cl: Temperature-dependent (223-298 K) absorption cross-sections and quantum yields at 254 nm

UV absorption cross-sections of trichloroacetyl chloride (CF3C(O)Cl) have been measured using two different apparatuses with spectral resolutions of 0.05 and 0.2 nm in the wavelength range 200-330 nm at temperatures ranging from 223 to 298 K. Photolysis studies of CF3C(O)Cl in N-2, air/C2H6 mixtures and air have been performed at 254 nm. Quantum yields for the dissociation of CF3C(O)Cl as a function of pressure and product quantum yields for Cl-2 and CO at 296 K have been determined. The temperature-dependent absorption cross-sections and new quantum yields were used to calculate photodissociation rate-constants for CF3C(O)Cl at different solar zenith angles as a function of altitude. Temperature effects of the photodissociation rate constants are discussed. (C) 1997 Elsevier Science S.A.