DISSOCIATION OF SO2 INTO METASTABLE FRAGMENTS FOLLOWING ELECTRON IMPACT. W.Kedzierski, C.Malone and J.W.McConkey School of Physical Sciences, University of Windsor, Ontario N9B 3P4, Canada. A novel method is employed to selectively detect O(1S) fragments following dissociation of SO2 by electron impact. A crossed beam apparatus with a pulsed electron beam is used to obtain time-of-flight, and hence energy, spectra of the O fragments. Absolute cross section data are presented over the energy range from threshold to 400 eV. Dissociation mechanisms are discussed.