J. Phys. Chem. A 1997, 101, 6667-6678
6667
Photodissociation of ClONO2: 2. Time-Resolved Absorption Studies of Product Quantum Yields R. J. Yokelson,† James B. Burkholder,* R. W. Fox,‡ and A. R. Ravishankara§ Aeronomy Laboratory, NOAA, 325 Broadway, Boulder, Colorado 80303, and CooperatiVe Institute for Research in EnVironmental Sciences, UniVersity of Colorado, Boulder, Colorado 80309 ReceiVed: March 4, 1997; In Final Form: May 22, 1997X
The quantum yield for NO3 production in the UV photolysis of ClONO2 was measured Via transient 661.9 nm absorption of NO3 following pulsed laser photolysis and was found to be 0.93 ( 0.24 at 352.5 nm, 0.67 ( 0.09 at 308.15 nm, 0.60 ( 0.09 at 248.25 nm, and 0.18 ( 0.04 at 193 nm. The Cl atom quantum yield was measured by reacting Cl with ClONO2 to produce NO3 through the reaction Cl + ClONO2 f Cl2 + NO3 and was found to be 0.73 ( 0.14 at 308.15 nm, 0.60 ( 0.12 at 248.25 nm, and 0.45 ( 0.08 at 193 nm. The estimated O atom yields were
