Temperature‐dependent ultrafast solvation dynamics in a completely nonpolar system
Temperature‐dependent ultrafast solvation dynamics in a completely nonpolar system
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完全非极性系统中温度依赖性超快溶剂化动力学
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Berg
中科院分区：
文献类型：
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作者：
J. Fourkas;M. Berg
本文报道了二甲基均四嗪在正丁基苯中从低粘度室温液体到低温玻璃的瞬态烧孔测量结果。结果给出了非极性溶质在非极性溶剂中的溶剂化的详细图像。的动力学分离成一个声子调制和结构的组成部分，如先前发现的极性溶剂。结构成分在玻璃中被冻结，但其弛豫速率随着温度的升高而增加到亚皮秒范围。结构弛豫的时间衰减是高度非指数的。溶质电子态与结构坐标的耦合接近线性，但与声子坐标的耦合不能用简单的线性或二次耦合模型来解释。效应也被发现，是由于耦合常数与密度变化的变化。
Transient hole burning measurements on dimethyl‐s‐tetrazine in n‐butylbenzene are reported from the low‐viscosity room‐temperature liquid down to the low‐temperature glass. The results give a detailed picture of the solvation of a nonpolar solute in a nonpolar solvent. The dynamics separate into a phonon modulated and a structural component, as was found previously for polar solvents. The structural component is frozen in the glass, but its relaxation rate increases into the subpicosecond range with increasing temperature. The time decay of the structural relaxation is highly nonexponential. The coupling of the solute electronic state to the structural coordinates is close to linear, but the coupling to the phonon coordinates cannot be accounted for by simple linear or quadratic coupling models. Effects are also found that are attributed to changes in coupling constants with changing density.