Translational energy and angular distributions of O(1D) and O(3Pj) 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 of vacuum-ultraviolet laser-induced fluorescence. Doppler profiles of the O(D-1) atoms are measured in the photodissociation of O-3 at 193, 230, 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 distributions;Ire derived from the Doppler profiles, from which photodissociation dynamics at each wavelength is discussed. The photodissociation dynamics in the Hartley band is characterized by the spin-allowed photodissociation processes from the O-3(B-1(2)) state. Below the blue end of the Hartley band, the photoexcitation process is mainly perpendicular transition. Multiple peaks observed in the translational energy distribution of O(D-1) and O(P-3) photoproducts from the photodissociation of O-3 at 193 nm are attributed to multiple dissociation processes accessible energetically. (C) 1998 Elsevier Science B.V. All rights reserved.