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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Enhancement of the Stimulated Raman Scattering of Benzene-Toluene Mixtures under Strong Excitation Condition in the Liquid Phase
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Enhancement of the Stimulated Raman Scattering of Benzene-Toluene Mixtures under Strong Excitation Condition in the Liquid Phase

机译：液相中强激发条件下苯-甲苯混合物受激拉曼散射的增强

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摘要

Anomalous enhancement of stimulated Raman scattering (SRS) of the aromatic CH stretching band was observed when the laser-induced plasma was generated in benzene-toluene mixed solvents. Time-resolved spectra of the SRS revealed that the strong excitation condition which led to generation of ionized molecules played an important role in anomalous enhancement. The observed intensity dependence on the mixture ratio meant that the complex formation between benzene and ionized toluene molecules contributed to its enhancement. Results of the theoretical calculation indicated that the Raman cross section of benzene and toluene molecules was remarkably enhanced due to the charge distribution between benzene and toluene cations compared to the Raman cross section in each neutral monomer state. The mechanism of the anomalous enhancement was considered in terms of the formation of cationic benzene-toluene complexes under the strong excitation condition and subsequent change of the Raman cross section due to the charge-resonant interaction in the cationic complexes.
机译：当在苯-甲苯混合溶剂中产生激光诱导的等离子体时，观察到芳香族CH拉伸带的受激拉曼散射（SRS）异常增强。 SRS的时间分辨光谱表明，导致离子化分子生成的强激发条件在异常增强中起重要作用。观察到的强度对混合比的依赖性意味着苯与离子化甲苯分子之间的络合物形成有助于其增强。理论计算结果表明，与每种中性单体状态下的拉曼截面相比，苯和甲苯阳离子之间的电荷分布显着提高了苯和甲苯分子的拉曼截面。考虑在强激发条件下阳离子苯-甲苯络合物的形成以及由于阳离子络合物中的电荷-共振相互作用而引起的拉曼截面的随后变化方面，异常增强的机理。

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