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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Molecular Dynamics of Auramine O in Low-Viscosity Solutions as Investigated by an Ultrafast Lensing Effect
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Molecular Dynamics of Auramine O in Low-Viscosity Solutions as Investigated by an Ultrafast Lensing Effect

机译：超快透镜效应研究低粘度溶液中金胺O的分子动力学

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摘要

Ultrafast change in refractive index after excitation by a femtosecond laser pulse was observed for dilute Auramine O solutions in low-viscosity solvents by detecting change as an ultrafast lensing effect (ULE). The decay of the ULE signals was found to consist of two components, and both their relaxation times depended on solvents. This is the first reported observation of the faster component by this technique. The slower component had a similar relaxation time to that of the fluorescence lifetime. Molecular orbital calculation results attributed the faster to relaxation in the lowest excited singlet state S_1 by way of internal rotation and the slower to the subsequent relaxation from S_1 to the ground state. Solvent dependence of the experimentally determined relaxation time was strongly correlated with the molecular weight of the solvents rather than their bulk viscosity. A simplified model explaining these results was proposed in which solute and solvent molecules interact only via hydrogen bonding, the strength of which is solvent independent.
机译：在飞秒激光脉冲激发后，通过检测超快透镜效应（ULE）的变化，观察到低粘度溶剂中的稀金胺溶液的折射率超快变化。发现ULE信号的衰减包括两个分量，并且它们的弛豫时间都取决于溶剂。这是该技术首次报道了更快的成分。较慢的组分具有与荧光寿命相似的弛豫时间。分子轨道计算结果归因于通过内部旋转在最低激发单重态S_1处的弛豫更快，而在随后的从S_1到基态的弛豫则更慢。实验确定的弛豫时间对溶剂的依赖性与溶剂的分子量而不是其整体粘度密切相关。提出了解释这些结果的简化模型，其中溶质和溶剂分子仅通过氢键相互作用，氢键的强度与溶剂无关。

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