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arXiv 2103.07340cond-mat.soft
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过冷液体中玻璃态动力学的时间分辨热透镜光谱:理论与实验

Time-resolved thermal lens spectroscopy of glassy dynamics in supercooled liquids: theory and experiments

Pengfei Zhang, Marco Gandolfi, Francesco Banfi, Christ Glorieux, Liwang Liu

摘要:

比热和线性热膨胀系数是热力学的基础,是研究玻璃化转变和玻璃态的重要弛豫量。然而,由于有限的光谱带宽,与机械和介电兼容性相比,它们的可能性被利用得少得多。这项工作报告的同时光谱的两个利用超快时间分辨热透镜(TL)光谱。详细的热弹性瞬态的弛豫系统进行超短激光加热的建模来描述TL响应。该模型已被应用于分析一组实验记录的TL波形,允许从sub-KHz到sub-100 MHz和从200-280 K的宽温度范围内的弛豫强度和弛豫频率的确定。

英文摘要:

Specific heat and linear thermal expansivity are fundamental thermal dynamics and have been proven as interesting relaxing quantities to investigate in glass transition and glassy state. However, their possibility has much less been exploited compared to mechanical and dielectric susceptibilities due to the limited spectroscopy bandwidth. This work reports on simultaneous spectroscopy of the two by making use of ultrafast time-resolved thermal lens (TL) spectroscopy. Detailed modeling of the thermoelastic transients of a relaxing system subjected to ultrashort laser heating is presented to describe the TL response. The model has been applied to analyze a set of experimentally recorded TL waveforms, allowing the determination of relaxation strength and relaxation frequency from sub-kilohertz to sub-100 MHz and in a wide temperature range from 200-280 K.

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