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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Solute Dependence of Three Pulse Photon Echo Peak Shift Measurements in Methanol Solution
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Solute Dependence of Three Pulse Photon Echo Peak Shift Measurements in Methanol Solution

机译：甲醇溶液中三个脉冲光子回波峰移测量的溶质依赖性

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摘要

Three pulse photon echo peak shift (3PEPS) measurement has recently become a popular method to study solvation and protein dynamics. In this paper, dependence of the 3PEPS signal on probe solute molecules was studied using several xanthene dyes and styryl dye molecules in methanol and compared with pump-probe measurements. For xandthene dyes, the decay was faster when the blue side of the absorption spectrum was excited. This effect is considered to be the result of a limited observation window and vibrational relaxation of the excess energy through higher density of states in the excited state. Nonlinear coupling may be also need to be considered. It seemed that the SPEPS signal was more sensitive to excited state dynamics rather than to the ground state ones. For styryl dyes, a gradual increase of the peak shift was observed in the picosecond region, which may be the result of photoinduced isomerization.
机译：三脉冲光子回波峰位移（3PEPS）测量最近已成为研究溶剂化和蛋白质动力学的流行方法。在本文中，使用甲醇中的几种x吨染料和苯乙烯基染料分子研究了3PEPS信号对探针溶质分子的依赖性，并与泵浦探针测量进行了比较。对于x吨染料，当吸收光谱的蓝色面被激发时，衰减更快。这种效应被认为是有限的观察窗口和通过激发态中更高的态密度使过量能量振动弛豫的结果。还可能需要考虑非线性耦合。似乎SPEPS信号对激发态动力学比对基态动力学更敏感。对于苯乙烯基染料，在皮秒区域观察到峰移的逐渐增加，这可能是光诱导异构化的结果。

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