2-甲基呋喃分子激发态超快非绝热动力学（英文）

发布时间：2018-03-03 20:37

本文选题：超快　切入点：光电子影像　出处：《物理化学学报》2017年03期 　论文类型：期刊论文

【摘要】：利用飞秒时间分辨的光电子影像技术研究了2-甲基呋喃分子激发态超快非绝热动力学。2-甲基呋喃分子吸收两个400 nm的光子后同时被激发到n=3的里德堡态S1[~1A′′(π3s)]、~1A′(π3p_x)、~1A″(π3p_y)、~1A″(π3p_z)和价电子态~1A′(ππ*),之后被两个800 nm的光子电离。通过母体离子产率随泵浦-探测延迟时间的变化曲线测得这些里德堡态与价电子态的平均寿命为50 fs。通过解析光电子能谱中n=3的里德堡态与价电子态所对应的组分峰的相对演化特征,观测到了这些激发态之间的内转换过程,并且揭示了价电子态~1A′(ππ*)在内转换过程中扮演的重要"纽带"作用。里德堡态与价电子态之间的混合,形成势能面间的锥形交叉,导致了如此超快的内转换过程。
[Abstract]:Femtosecond time-resolved photoelectron imaging has been used to study the ultrafast nonadiabatic kinetics of the excited state of 2-methylfuran. The absorption of two 400nm photons by the 2-methylfuran molecule was simultaneously excited to the Rydberg state S1 (蟺 3s) of nnion 3. The electron states (蟺蟺) are ionized by two photons at 800 nm. The average lifetime of these Rydberg states and valence electron states is 50 fs measured by the dependence of the yield of the parent ions on the pump-probe delay time. In the light of the photoelectron spectroscopy, the average lifetime of these Rydberg states and valence electron states is 50 fs. The relative evolution characteristics of the component peaks corresponding to the Rydberg state and valence electron state of Nb3, The internal conversion processes between these excited states are observed, and the important "bond" function of valence electron state ~ (1) A ~ (1) (蟺蟺) is revealed. The mixing of Rydberg state and valence electron state forms a conical cross between potential energy planes. Resulting in such an ultra-fast internal conversion process.
【作者单位】：中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室;中南民族大学电子信息工程学院;
【基金】：supported by the National Natural Science Foundation of China(21273274,21303255,11404411)~~
【分类号】：O644.1;O626.11

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