PHOTOFRAGMENT IMAGING OF OZONE PHOTODISSOCIATION - O-3-]O(P-3(J))+O-2((X)OVER-TILDE,V) AT 226-NM

We report photofragment angle velocity distributions of the O(P-3(j)=0,1,2) state for ozone photolysis at 226 nm in a time-of-flight mass spectrometer. A bimodal translational energy spectrum was recorded at 226 nm that peaked at internal energies of O-2(X (3) Sigma(g),upsilon) of upsilon = 15 and 27, in general agreement with the measurements of Miller et al. [Science 1994, 265, 1831]. The yield of O-2(upsilon greater than or equal to 26) relative to total O-2(X,upsilon) is measured to be 0.06 by the O(3P) channel. This figure is important for evaluating a recently proposed explanation of the ozone deficit problem in the upper stratosphere. An anisotropy of beta = 1.2 was measured for the high-velocity component corresponding to a M(y) type transition and prompt dissociation. This is consistent with a pure <(B)over tilde(1)B(2)> <-- <(X)over tilde(1)A(1)> transition.