氢键液体N-甲基乙酰胺和水的结构弛豫的光学克尔效应研究
Structural relaxation in the hydrogen-bonding liquids N-methylacetamide and water studied by optical Kerr-effect spectroscopy
摘要：
在肽模型N-甲基乙酰胺（NMA）的结构弛豫实验研究超快光学克尔效应光谱在正常液体温度范围内，并在室温下在水中测得的松弛相比。可以看出，在这两种氢键液体中，β弛豫是存在的，并且在每种情况下，发现这可以通过科尔-科尔函数来描述。对于NMA在这个温度范围内，α和β弛豫各自被发现有一个Arrhenius温度依赖性与不可区分的活化能。众所周知，德拜函数的变化，包括科尔-科尔函数，是非物理的，我们介绍两个一般的修改：一个允许的功能，由Librational频率确定的初始上升，第二个允许的功能，以终止在α松弛。
英文摘要：
Structural relaxation in the peptide model N-methylacetamide (NMA) is studied experimentally by ultrafast optical Kerr-effect spectroscopy over the normal-liquid temperature range and compared to the relaxation measured in water at room temperature. It is seen that in both hydrogen-bonding liquids, beta relaxation is present and in each case it is found that this can be described by the Cole-Cole function. For NMA in this temperature range, the alpha and beta relaxations are each found to have an Arrhenius temperature dependence with indistinguishable activation energies. It is known that the variations on the Debye function, including the Cole-Cole function, are unphysical, and we introduce two general modifications: one allows for the initial rise of the function, determined by the librational frequencies, and the second allows the function to be terminated in the alpha relaxation.
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