论文标题
从实验二维Terahertz-Infrared-Visible光谱中提取样品响应函数
Extracting the sample response function from experimental two-dimensional terahertz-infrared-visible spectra
论文作者
论文摘要
在不同类型的非线性振动光谱法中，高频分子振荡器通常探测Terahertz分子运动。最近开发的二维Terahertz-Infrared-Visible光谱可以直接测量此耦合，因此获得了特定位点特异性的Terahertz振动光谱。但是，这些数据受使用的激光脉冲的强度和相影响。在这项工作中，我们开发了一种从实验光谱中提取样品响应的方法 - 仅代表材料的物理特性。使用二甲基亚氧化二甲基（DMSO）作为模型分子来验证这种方法，我们测量其甲基的C-H弹力振动与Terahertz分子内扭曲和摇摆模式之间的耦合。
Terahertz molecular motions are often probed by high-frequency molecular oscillators in different types of non-linear vibrational spectroscopy. Recently developed two-dimensional terahertz-infrared-visible spectroscopy allows direct measuring of this coupling and, thus, obtaining site-specific terahertz vibrational spectrum. However, these data are affected by the intensity and phase of the employed laser pulses. In this work, we develop a method of extracting sample response - representing solely physical properties of a material - from experimental spectra. Using dimethyl sulfoxide (DMSO) as a model molecule to verify this method, we measure the coupling between C-H stretch vibration of its methyl groups and terahertz intramolecular twist and wagging modes.
