Study of time resolved Spectroscopic dynamics and it`s experimental setup

• Main Authors: chen, youn-chan, 陳永昌
• Other Authors: Pi-Tai Chou
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/57307844096178682189

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.