| Summary: | 碩士 === 國立中正大學 === 化學研究所 === 85 === Using the C60 fluorescence as a reference in combination with
the direct spec-troscopic observation of singal oxygen visible
emission, the photophysics of singal oxygen dimol and states in
solution has been studied. The quantum yieldof singal oxygen
emission has been measured to be 1.94*10^(-7), and consequen-
tly, the radiative decay rate of singal oxygen transition was
determined to be1.15 per secend which, within the experimental
error, is consistent with the previous report of 0.46 per
secend. Further determination of the ratio betweenradiative
decay and dissociation rates of the singal oxygen dimol has been
achieved by comparing the dimol emission intensity with the
tetra-tert-butylphthalocyanine deylayed fluorescence induced by
a two-step energy transfer from thesingal oxygen state.as a
result, the rate of dissociationof the dimol was est-imated to
be 3*10^10 in CCl4. Due to the lack of observing 765nm emission
uponC60 sensitizing singal oxygen emission, an upper limit of
37kcal/mol for the triplet state energy in CCl4 was concluded
for C60.
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