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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Femtosecond Time-Resolved Stimulated Raman Spectroscopy of the S_2 (1B_u~+) Excited State of beta-Carotene
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Femtosecond Time-Resolved Stimulated Raman Spectroscopy of the S_2 (1B_u~+) Excited State of beta-Carotene

机译：飞秒时间分辨的β-胡萝卜素S_2（1B_u〜+）激发态的拉曼光谱

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摘要

The electronic and vibrational structure of beta-carotene's early excited states are examined using femtosecond time-resolved stimulated Raman Spectroscopy.The vibrational spectrum of the short-lived (approx 160 fs) second excited singlet state (S_2,1B_u~+) of beta-carotene is obtained.Broad,resonantly enhanced vibrational features are observed at M100,1300,and 1650 cm~(-1) that decay with a time constant corresponding to the electronic lifetime of S_2.The temporal evolution of the vibrational spectra are consistent with significant population of only two low-lying excited electronic states (1B_u~++ and 2A_g~-) in the ultrafast relaxation pathway of beta-carotene.
机译：使用飞秒时间分辨的受激拉曼光谱研究了β-胡萝卜素的早期激发态的电子和振动结构.β-胡萝卜素的短时（约160 fs）的第二激发单重态（S_2,1B_u〜+）的振动光谱在M100,1300和1650 cm〜（-1）处观察到广泛，共振增强的振动特征，其衰减的时间常数对应于S_2的电子寿命。振动光谱的时间演化与显着一致β-胡萝卜素超快弛豫途径中只有两个低位激发电子态（1B_u〜++和2A_g〜-）的存在。

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