The low-frequency torsional modes, index of refraction, and absorption of a tryptophan film and pressed powders from 0.2 to 2.0 THz (6.6–66 cm−1) were measured by terahertz time-domain spectroscopy at room temperature. It was found that there were two dominated torsional vibrational modes at around 1.435 and 1.842 THz. The associated relaxation lifetimes (∼1 ps) for these modes of the tryptophan molecule were measured. Using a density-functional calculation, the origins of the observed torsional vibrations were assigned to the chain and ring of the tryptophan molecule.
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机译：在室温下通过太赫兹时域光谱仪测量了0.2至2.0 THz（6.6-66 cm -1 ）的色氨酸膜和压制粉末的低频扭转模式，折射率和吸收率温度。发现在1.435和1.842 THz附近有两种主要的扭转振动模式。测量了这些色氨酸分子模式的相关弛豫寿命（〜1 ps）。使用密度函数计算，将观察到的扭转振动的起源分配给色氨酸分子的链和环。
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