Abstract
The problem of interpretation of solvent effects in photodynamic reaction has been. due to the inability of researchers to distinguish between solvent effects on the rate of decay of singlet oxygen and the rate constants for the reactions of singlet oxygen with organic compounds. We concluded the life time of excited triplet state by measuring T-T absorption induced by Nd-YAG SHG and N2 dye laser. The life time of excited triplet state in CCl4 solution was 480ns and in C2H5OH solution was 280ns. The difference of life time in CCl4 solution and C2H5OH solution was supposed to be due to radiationless energy transfer by molecular vibration and dissolved oxygen concentration. Determination of life time is thought to be significant to determine the rate equation of singlet oxygen 1O2 via excited dye triplet state.
