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首页> 外文会议>International Symposium on Fullerenes 2000 Vol.8: Electrochemistry and Photochemistry, May 14-18, 2000, Toronto >THERMALLY ACTIVATED PROCESSES IN FULLERENE EXCITED STATES
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THERMALLY ACTIVATED PROCESSES IN FULLERENE EXCITED STATES

机译：富勒烯激发态中的热活化过程

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摘要

Three temperature-dependent studies of fullerene photoprocesses are presented. The first involves photodissociation of C_(120), the dimer of C_(60), into C_(60) monomers. This process is found to proceed from the lowest triplet state of C_(120) with quantum yields ranging from 0.002 at 297 K to 0.037 at 333 K. Arrhenius analysis shows an activation energy on the triplet surface of 64 kJ mol~(-1), and a frequency factor characteristic of low frequency vibrational modes. In another study, time-resolved thermally activated delayed fluorescence is demonstrated to provide kinetic data on fullerene triplet state decays, as well as values for S_1 - T_1 energy gaps. The relative uncertainties in these energy gap determinations are approximately 2%, or comparable to those of other methods. The third study explores the temperature dependence of intrinsic T_1 decay in C_(60), C_(70), 1,2-C_(60)H_2, and 1,2-C_(70)H_2. At 77 K, the decay constants within this set of fullerenes vary by a factor of 1000. Analysis of the temperature variations shows that thermal activation from T_1 to S_1 followed by S_1 →S_0 internal conversion plays a significant role in triplet state decay near room temperature. Values are deduced for the S_1→>S_0 internal conversion rate constants in these compounds.
机译：提出了三种与温度有关的富勒烯光致过程的研究。首先涉及C_（60）的二聚体C_（120）的光解离为C_（60）单体。发现该过程从C_（120）的最低三重态开始，量子产率从297 K时的0.002到333 K时的0.037。Arrhenius分析显示三重态表面上的活化能为64 kJ mol〜（-1）。 ，以及低频振动模式的频率因子特性。在另一项研究中，时间分辨的热活化延迟荧光被证明可提供有关富勒烯三重态衰变的动力学数据，以及S_1-T_1能隙的值。这些能隙确定中的相对不确定度约为2％，或与其他方法相当。第三项研究探讨了C_（60），C_（70），1,2-C_（60）H_2和1,2-C_（70）H_2中固有T_1衰减的温度依赖性。在77 K时，这组富勒烯内的衰变常数相差1000倍。对温度变化的分析表明，从T_1到S_1的热活化，然后由S_1→S_0的内部转化，在室温附近的三重态衰变中起着重要作用。 。推导这些化合物中S_1→> S_0内部转化率常数的值。

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