Department of Chemistry, Faculty of Science , Gakushuin University , 1-5-1 Mejiro , Toshima-ku , Tokyo 171-8588 , Japan.
J Phys Chem A. 2019 Oct 24;123(42):9158-9165. doi: 10.1021/acs.jpca.9b06354. Epub 2019 Oct 9.
Low-frequency intermolecular motions are of importance for understanding the structure of molecular liquids, which can be elucidated by Raman spectroscopy. A liquid droplet provides a field where stimulated Raman scattering (SRS) readily proceeds. Our previous study showed that multiorder SRS is more effectively generated in colliding droplets than a single droplet. Here we report that the multiorder SRS generated in colliding benzene droplets included low-frequency bands of the liquid benzene, which is considered to represent a temporal state of liquid emerging in the course of the droplet collision. This method enables measurements of the low-frequency intermolecular motions of the novel liquid state emerging at the mixed region of the colliding droplet without suffering from background of Rayleigh scattering.
低频分子间运动对于理解分子液体的结构很重要，拉曼光谱可以揭示这一点。液滴提供了一个很容易进行受激拉曼散射（SRS）的场。我们之前的研究表明，在碰撞液滴中比单个液滴更有效地产生多阶 SRS。在这里，我们报告说，在碰撞的苯液滴中产生的多阶 SRS 包括液体苯的低频带，这被认为代表了在液滴碰撞过程中出现的液体的暂时状态。这种方法可以在不受到瑞利散射背景影响的情况下，测量在碰撞液滴混合区出现的新型液体状态的低频分子间运动。
