specific heat容量和热膨胀系数的Debye或Havriliak-Negami弛豫过冷液体中的脉冲受激散射信号
Impulsive stimulated scatttering signal in supercooled liquids with Debye or Havriliak-Negami relaxation of the specific heat capacity and thermal expansion coefficient
摘要：
提出了一个广义的物理模型来描述周期光栅结构中弛豫系统对光热激发的脉冲受激散射响应。所提出的方法从Debye和Havriliak-Negami表达式开始，用于频率依赖的热容C（ω）和热膨胀系数γ（ω）。对甘油进行模拟，以测试和比较开发的模型与现有的半经验模型[1]。德拜行为的比热容是兼容的两个温度的情况下，其中，除了经典的，实验上可观察到的温度，其特征在于振动能量状态的系统的分布，第二个温度的特征在于状态的构型能量景观。这里开发的模型已被应用于解释过冷甘油的实验ISS信号，说明从热弹性瞬态的C（ω）和γ（ω）的同时和单独的评估高达100 MHz以下。
英文摘要：
A generalized physical model is introduced to describe the impulsive stimulated scattering (ISS) response of relaxing systems to photothermal excitation in a periodical grating geometry. The proposed approach starts from Debye and Havriliak-Negami expressions for both the frequency-dependent heat capacity, C(ω), and thermal expansion coefficient, γ(ω). Simulations are carried out on glycerol to test and compare the developed models with the existing semi-empirical model [1]. Debye behavior of the specific heat capacity is shown to be compatible with a two-temperature scenario, in which, in addition to the classical, experimentally observable temperature that characterizes the distribution of the system over vibrational energy states, a second temperature characterizes the state of the configurational energy landscape. The models here developed have been applied for the interpretation of the experimental ISS signals of supercooled glycerol, illustrating simultaneous and separate assessment of C(ω) and γ(ω) up to sub-100 MHz from thermoelastic transients.
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