The photophysical properties of O-1(2) dimol ((1)Delta(g))(2) --> ((3)
Sigma(g)(-))(2) transition have been studied by Nile Blue A (NBA) dela
yed fluorescence induced by energy transfer from the O-1(2) dimol. As
a result, a radiative lifetime of (1.2 +/- 0.3) x 10(3) s(-1) was dedu
ced in CDCl3 through a plot of the intensity ratio between NEA delayed
fluorescence and '0, dimol as a function of NEA concentration. (C) 19
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