| 反式-4-甲氧基偶氮苯超快激发态性质研究 |
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| 引用本文： | 王雅萍,李春华,张 冰,秦 晨,张 嵩. 反式-4-甲氧基偶氮苯超快激发态性质研究[J]. 化学物理学报, 2018, 31(6): 749-755 |
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| 作者姓名： | 王雅萍 李春华 张 冰 秦 晨 张 嵩 |
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| 作者单位： | 合肥工业大学电子科学与应用物理学院，合肥 230009,合肥工业大学电子科学与应用物理学院，合肥 230009,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，武汉 430071,新疆师范大学物理与电子工程学院，新疆矿物发光材料及其微结构实验室，乌鲁木齐 830054,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，武汉 430071 |
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| 摘 要： | 本文利用飞秒瞬态吸收光谱结合量化计算研究了反式-4-甲氧基偶氮苯的超快激发态动力学和光异构过程. 瞬态光谱中在400∽480 nm波段出现永久的正吸收，表明反式分子被激发到第二激发态后最终产生了顺式结构. 在乙醇和乙二醇溶剂环境中分别获得了三个衰减组分，时间分别为0.11、1.4、2.9 ps和0.16、1.5、7.5 ps. 快速的时间组分是源自第二激发态弛豫到第一激发态的内转换过程. 另外两个组分和第一激发态的弛豫相关:一个是经第一激发态的内转化和光异构过程，另一个是顺式结构的振动冷却过程. 基于不同溶剂环境中的动力学差别，证实了光异构路径是反转机制而不是旋转机制.
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| 关 键 词： | 光异构，反式-4-甲氧基偶氮苯，飞秒瞬态吸收光谱 |
| 收稿时间： | 2018-06-26 |
Ultrafast Investigation of Excited-State Dynamics in Trans-4-methoxyazobenzene Studied by Femtosecond Transient Absorption Spectroscopy |
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| Ya-ping Wang,Chun-hua Li,Bing Zhang,Chen Qin and Song Zhang. Ultrafast Investigation of Excited-State Dynamics in Trans-4-methoxyazobenzene Studied by Femtosecond Transient Absorption Spectroscopy[J]. Chinese Journal of Chemical Physics, 2018, 31(6): 749-755 |
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| Authors: | Ya-ping Wang Chun-hua Li Bing Zhang Chen Qin Song Zhang |
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| Affiliation: | School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, China,School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, China,State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China,Key Laboratory of Mineral Luminescent Material and Microstructure of Xinjiang, School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The ultrafast photoisomerization and excited-state dynamics of trans-4-methoxyazobenzene (trans-4-MAB) in solutions were investigated by femtosecond transient absorption spectroscopy and quantum chemistry calculations. After being excited to the S2 state, the two-dimensional transient absorptions spectra show that cis-4-MAB is produced and witnessed by the permanent positive absorption in 400-480 nm. Three decay components are determined to be 0.11, 1.4 and 2.9 ps in ethanol, and 0.16, 1.5 and 7.5 ps in ethylene glycol, respectively. The fast component is assigned to the internal conversion from the S2 to S1 state. The other relaxation pathways are correlated with the decay of the S1 state via internal conversion and isomerization, and the vibrational cooling of the hot S0 state of the cis-isomer. Comparing of the dynamics in different solvents, it is demonstrated that the photoisomerization pathway undergoes the inversion mechanism rather than the rotation mechanism. |
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| Keywords: | Photoisomerization Trans-4-methoxyazobenzene Femtosecond transient absorption spectroscopy |
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