Translational energy and angular distributions of O( [formula omitted]) and O( [formula omitted]j) fragments in the UV photodissociation of ozone

Abstract

Nascent O( 1 D ) and O( 3 P ) photoproducts from the photodissociation of O 3 are state-selectively detected in a flow cell, using a technique of vacuum-ultraviolet laser-induced fluorescence. Doppler profiles of the O( 1 D ) atoms are measured in the photodissociation of O 3 at 193, 230, and 266 nm, and those of the O( 3 P ) atoms at 193, 266 and 308 nm. The translational energy and the speed-resolved spatial angular distributions are 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( 1 B 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( 1 D ) and O( 3 P ) photoproducts from the photodissociation of O 3 at 193 nm are attributed to multiple dissociation processes accessible energetically.