Abstract
The second excited state 1 Σ g + of O 2 has been detected for the first time in time-resolved measurements at room temperature in solution. The lifetime τ Σ of O 2 ( 1 Σ g + ) was determined via the 1 Σ g + → 1 Σ g - phosphorescence to be 130±10 ns in CCl 3 . In addition rate constants of O 2 ( 1 Σ g + ) quenching by several solvent molecules M have been measured in diluted solution in CCl - , allowing the estimation of values of τ Σ in pure solvents of about 20 ps in methanol, 80 ps in cyclohexane, 120 ps in acetone, 130 ps in acetonitrile and in benzene, and 1.2 ns in chloroform
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