TRANSLATIONAL ENERGY AND ANGULAR-DISTRIBUTIONS OF O(D-1) AND O(P-3(J)) FRAGMENTS IN THE UV PHOTODISSOCIATION OF OZONE

Nascent O(D-1) and O(P-3) photoproducts from the photodissociation of O-3, an state-selectively detected in a flow cell, using a technique o f vacuum-ultraviolet laser-induced fluorescence. Doppler profiles of t he O(D-1) atoms are measured in the photodissociation of O-3 at 193, 2 30, and 266 nm, and those of the O(P-3) atoms at 193, 266 and 308 nm. The translational energy and the speed-resolved spatial angular distri butions;Ire derived from the Doppler profiles, from which photodissoci ation dynamics at each wavelength is discussed. The photodissociation dynamics in the Hartley band is characterized by the spin-allowed phot odissociation processes from the O-3(B-1(2)) state. Below the blue end of the Hartley band, the photoexcitation process is mainly perpendicu lar transition. Multiple peaks observed in the translational energy di stribution of O(D-1) and O(P-3) photoproducts from the photodissociati on of O-3 at 193 nm are attributed to multiple dissociation processes accessible energetically. (C) 1998 Elsevier Science B.V. All rights re served.