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首页> 外文期刊>Chemical Physics: A Journal Devoted to Experimental and Theoretical Research Involving Problems of Both a Chemical and Physical Nature >Fluorescence spectroscopy of C_(60) in toluene solutions at 5 K
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Fluorescence spectroscopy of C_(60) in toluene solutions at 5 K

机译：5 K下甲苯溶液中C_（60）的荧光光谱

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摘要

We have recorded the dispersed fluorescence and the fluorescence excitation spectra of C_(60) in toluene matrices at 5 K. Upon excitation with the green Ar~+ laser line (λ = 514 nm) we obtained for the first time in this matrix well resolved visible fluorescence spectra which we have compared with those observed in other low temperature matrices. Our spectra were interpreted and assigned using theoretical assessments of vibronic activities of transitions between the three lowest excited electronic states ~1T_(1g), ~1T_(2g), ~1G_g and the totally symmetric ground state, and on the basis of a single 0~0 level which has pseudo-Jahn-Teller (JT) components of the three near-degenerate excited states. The fluorescence spectra exhibit prominent JT induced h_g(1) progressions, Herzberg-Teller-induced h_u and other ungerade mode vibrations, including a very active t_(1u)(4) mode. Excitation wavelength independent bands are assigned to the fluorescence of C_(60) molecules in toluene microcrystals embedded in the toluene glass whereas excitation wavelength dependent features are interpreted as originating from C_(60) molecules isolated in the toluene glass itself. These interpretations are supported by the results of spectrally selective detected fluorescence excitation spectra.
机译：我们已经记录了在5 K下甲苯基质中C_（60）的分散荧光和荧光激发光谱。用绿色Ar〜+激光线（λ= 514 nm）激发后，我们首次在该基质中获得了良好的分离度我们已经将其与其他低温基质中观察到的荧光光谱进行了比较。使用对三个最低激发电子态〜1T_（1g），〜1T_（2g），〜1G_g和完全对称基态之间跃迁的振动学理论评估来解释和分配我们的光谱〜0能级，具有三个简并激发态的伪Jahn-Teller（JT）分量。荧光光谱显示出显着的JT诱导的h_g（1）进程，Herzberg-Teller诱导的h_u和其他ungerade模式的振动，包括非常活跃的t_（1u）（4）模式。与激发波长无关的谱带分配给嵌入在甲苯玻璃中的甲苯微晶中C_（60）分子的荧光，而与激发波长相关的特征被解释为源于在甲苯玻璃本身中分离的C_（60）分子。这些解释得到光谱选择性检测的荧光激发光谱的结果的支持。

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