The molecular rotational motion of liquid ethanol studied by ultrafast time resolved infrared spectroscopy
The molecular rotational motion of liquid ethanol studied by ultrafast time resolved infrared spectroscopy
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超快时间分辨红外光谱研究液体乙醇的分子旋转运动
DOI：
10.1039/c6cp07380h
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发表时间：
2017
影响因子：
3.3
通讯作者：
Yang Xueming
中科院分区：
文献类型：
--
作者：
Deng Gang-hua;Shen Yuneng;He Zhigang;Zhang Qiang;Jiang Bo;Yuan Kaijun;Wu Guorong;Yang Xueming
本文用超快时间分辨红外光谱技术研究了液体乙醇分子的旋转运动。结果表明，甲基、亚甲基和CO基团的转动弛豫时间相近，为1-2ps，羟基(-OH)的转动弛豫时间为8.1ps。甲基、亚甲基和CO基团的快速运动和羟基的慢运动表明乙醇分子在液相中经历了各向异性运动。羟基的缓慢运动也表明氢键网络可以被认为是一个有效的分子。本报告提供的实验数据有助于理论家建立模型来理解液体乙醇的分子旋转运动。此外，我们的实验方法可以提供更多关于液体分子亚群旋转运动的数据，这将有助于理解复杂的分子在液体相中的运动。
In this report, ultrafast time-resolved infrared spectroscopy is used to study the rotational motion of the liquid ethanol molecule. The results showed that the methyl, methylene, and CO groups have close rotational relaxation times, 1–2 ps, and the rotational relaxation time of the hydroxyl group (–OH) is 8.1 ps. The fast motion of the methyl, methylene and CO groups, and the slow motion of the hydroxyl group suggested that the ethanol molecules experience anisotropic motion in the liquid phase. The slow motion of the hydroxyl group also shows that the hydrogen bonded network could be considered as an effective molecule. The experimental data provided in this report are helpful for theorists to build models to understand the molecular rotational motion of liquid ethanol. Furthermore, our experimental method, which can provide more data concerning the rotational motion of sub groups of liquid molecules, will be useful for understanding the complicated molecular motion in the liquid phase.