REACTIONS OF O-2(A(1)DELTA(G)) WITH O- AND O-2-

We have measured the rate coefficients for the processes O- + O-2(a(1) Delta(g)) and O-2(-) + O-2(a(1) Delta(g)) with improved and calibrate d optical diagnostics and additional diagnosis of neutral metastable s pecies. These measurements are an order of magnitude smaller than earl ier results, and the uncertainty in the rate coefficients has been red uced from a factor of 10 to less than +100%/-50%. A fast reaction of t he negative ions is observed with an unknown species arising in the di scharge source of O-2(a(1) Delta(g)). The analysis suggests O-2 (X, a states with vibrational levels >1) could be the neutral reactant partn er. Measurement of the O- + CO2 rate is also reported.