Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, China.
J Chem Phys. 2023 Feb 14;158(6):064302. doi: 10.1063/5.0137238.
Supercontinuum radiation has found numerous applications in diverse fields encompassing spectroscopy, pulse compression, and tunable laser sources. Anomalous enhanced stimulated Raman scattering (SRS) of cyclohexane-benzene mixtures was obtained in this study. SRS of the pure solvent, the multi-order Stokes of the strongest fundamental vibration modes, and energy transfer in intra-molecular modes were observed. SRS of the mixture revealed that the cross-pumping effect was generated between the C-H stretching (v) mode of cyclohexane and the C=C ring skeleton (v) mode of benzene, thereby producing the intermolecular secondary stimulated Raman emission and the appearance of two super-broadband radiations at 664.36-673.9 nm and 704.62-729.22 nm. The results suggest that the energy transfer of intermolecular vibrational modes, where the strongest vibrational mode excites other vibrational modes, is a simple approach for generating supercontinuum coherent radiation.
超连续谱辐射在光谱学、脉冲压缩和可调谐激光源等多个领域有广泛的应用。本研究中获得了环己烷-苯混合物的反常受激拉曼散射(SRS)。观察到了纯溶剂的 SRS、最强基频振动模式的多阶斯托克斯和分子内模式的能量转移。混合物的 SRS 表明,环己烷的 C-H 伸缩(v)模式和苯的 C=C 环骨架(v)模式之间产生了交叉泵送效应,从而产生了分子间二次受激拉曼发射,出现了两个超宽带辐射,分别在 664.36-673.9nm 和 704.62-729.22nm。结果表明,通过最强振动模式激发其他振动模式的分子间振动模式能量转移是产生超连续相干辐射的一种简单方法。