THE SENSITIZED O-2((1)DELTA(G)) DIMOL LUMINESCENCE IN SOLUTION

An ultrasensitive millisecond detecting system has been developed to s tudy the O-2((1) Delta(g)) dimol luminescence in solution. In all solv ents studied the O-2((1) Delta(g)) dimol emission intensity is quadrat ically proportional to the excitation energy and its decay dynamics co rrespond to twice the decay rate of O-1(2)((1) Delta(g)). The intensit y ratio for the 0.0 vs. 0,1 bands was found to be O-2((3) Sigma(g)(-)) concentration dependent, suggesting that in addition to the emission involving two colliding O-2((1) Delta(g)) molecules, the interaction b etween O-2((3) Sigma(g)(-)) and O-1(2) dimol may also play a minor rol e to account for the simultaneous transition. (C) 1997 Elsevier Scienc e B.V.