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Ultrafast Excited State Dynamics of trans-4-Aminoazobenzene Studied by Femtosecond Transient Absorption Spectroscopy (cited: 1)
Ya-ping Wang,Song Zhang*,Si-mei Sun,Kai Liu,Bing Zhang*
Author NameAffiliationE-mail
Ya-ping Wang State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China  
Song Zhang* State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China zhangsong@wipm.ac.cn 
Si-mei Sun State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China  
Kai Liu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China  
Bing Zhang* State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China bzhang@wipm.ac.cn 
Abstract:
The ultrafast excited state dynamics of trans-4-aminoazobenzene (trans-4-AAB) in ethanol was investigated by femtosecond transient absorption spectroscopy. After being excited to the S2 state by 400 nm, trans-4-AAB decays from the S2 state to the hot S1state by internal conversion with time constant of ~70 fs. The photoisomerization through inversion mechanism on the S1 potential energy surface and the internal conversion from the S1 state to the hot S0 state are observed, respectively. The average timescale of these two decay pathways is ~0.7 ps. And the vibrational cooling of the hot S0 state of cis- and trans-4-AAB occur with time constants of ~4 and ~13 ps, respectively. Furthermore, the ultrafast intersystem crossing process are also observed. The timescale of intersystem crossing from the S2 state to the T4 state is about 480 ps while from the S1 state to the T2 state is ~180 ps.
Key words:  Photoisomerization, trans-4-AAB, Femtosecond transient absorption spec-troscopy, Intersystem crossing
FundProject:
飞秒瞬态吸收光谱技术研究反式对氨基偶氮苯的超快激发态动力学 (cited: 1)
王雅萍,张嵩*,孙四梅,刘凯,张冰*
摘要:
利用飞秒瞬态吸收光谱技术研究了反式对氨基偶氮苯(AAB)溶解在乙醇中的超快激发态动力学.当利用400 nm光激发分子到S2态后,由S211102412
关键词:  光异构化,反式对氨基偶氮苯,瞬态吸收光谱,飞秒时间分辨
DOI:10.1063/1674-0068/26/06/651-655
分类号: