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) h ave been measured using two different apparatuses with spectral resolu tions of 0.05 and 0.2 nm in the wavelength range 200-330 nm at tempera tures 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 yi elds for the dissociation of CF3C(O)Cl as a function of pressure and p roduct quantum yields for Cl-2 and CO at 296 K have been determined. T he temperature-dependent absorption cross-sections and new quantum yie lds were used to calculate photodissociation rate-constants for CF3C(O )Cl at different solar zenith angles as a function of altitude. Temper ature effects of the photodissociation rate constants are discussed. ( C) 1997 Elsevier Science S.A.