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Detection of Electronic Coherence via Two-Dimensional Electronic Spectroscopy in condensed Phase

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Chinese Journal of Chemical physics 2018年第2期31卷 135-151,245页

作者： yu-xiang weng laboratory of soft {2. physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Two dimensional Fourier transforrn electronic spectroscopy （2.ES） in the visible region enables direct observation of complex dynamics of molecules including quantum coherence in the condensed phase. This review aims to provide a bridge between the principles and intuitive physical description of 2.ES for tutorial purpose. Special emphasis is laid upon how 2.ES circumvents the restrictions from both uncertainty principle and the wave-packet collapse during the coherent detection, leading to the successful detection of the coherence in terms of energy difference between the eigenstates showing as the quantum beats; then upon the possible mixing among the pure electronic transition, single-rnode and multi-mode coupled vibronic transition leading to the observed beating phenomena. Finally, recent ad- vances in experimentally distinguishing between the electronic coherence and the vibrational coherence are briefly discussed.

关键词： Quantum coherence Uncertainty principle Wave-packet collapse Multi-rnodevibronic coupling Two dimensional electronic spectroscopy

Control on β conformation of poly(9,9-di-n-octylfluorene)via solvent annealing

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Chinese physics B 2019年第7期28卷 345-348页

作者： Zhi Chao Zhang Bing yue Zhang yu Yan {2. Tian Hui Zhang Center for soft condensed {2. physics and Interdisciplinary Research and College of physics Soochow University Suzhou 215006 China national laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China

Films of poly(9,9-dioctylfluorene)(PFO) are of great importance in fabricating light emitting *** practice, theβ-phase of PFO is expected due to its high efficiency in the transport of charge *** promote the formation of β-phase,PFO films are immersed and annealed in the mixture of solvent/*** effects of temperature, solvent/nonsolvent ratio, and annealing time are examined *** is found that the fraction of β-phase can be highly improved by increasing the ratio of solvent/*** reconfiguration of PFO molecules for β-phase in annealing is generally finished in 10 *** finding in this study demonstrates that solvent-assisted annealing offers a fast and economic approach for mass annealing.

关键词： organic crystal conjugated polymer solvent annealing

Transitional Process of Ploy（N-isopropylacrylamide） in Deuterated Solution

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Chinese Journal of Chemical physics 2009年第5期22卷 447-452,I0001页

作者： Shao-hua Zhang Yang Chen Heng Li yu-xiang weng Hefei national laboratory for Physical Sciences at the Microscale Department of Chemical PhysicsUniversity of Science and Technology of China Hefei 230026 China laboratory of soft {2. physics Institute of Physics Chinese Academy of Sciences beijing national {2. of condensed matter physics Beijing 100080 China

The fast phase-transitional process of ploy（N-isopropylacrylamide）（PNIPAM） in deuterated solution was studied by laser induced temperature jump technique combined with time-resolved mid-infrared absorbance difference spectroscopy on nanosecond level. The multi-peaks of amide I＇band of PNIPAM among the energy range of 1565-1700 cm^-1 was experimentally resolved to three groups （i, ii, iii） for the first time, while the distinct threestage procedure in the phase transitional process of long-chain PNIPAM was observed firstly too. Furthermore, proper assignments were also made for the three group peaks in amide I＇band and the three steps in the kinetics process of long-chain PNIPAM.

关键词： Poly(N-isopropylacrylamide) Laser induced temperature jump Kinetic Transient mid-infrared absorbance difference spectroscopy Multistage Transitional process

量子相干态的二维电子光谱测量的原理、应用和发展

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物理学报 2018年第12期67卷 196-202页

作者：翁羽翔王专陈海龙冷轩朱锐丹中国科学院物理研究所北京凝聚态物理国家研究中心软物质物理重点实验室北京100190 中国科学院大学北京100049

二维电子光谱是一种同时具有高的时间分辨率和光谱分辨率的非线性光谱学方法.它不仅可以对凝聚相分子复杂动力学过程进行直接测量,还可以测量不同电子态、电子态-振动态之间的量子相干过程.2.07年,Flemming课题组利用二维电子光谱于低温... 详细信息

二维电子光谱是一种同时具有高的时间分辨率和光谱分辨率的非线性光谱学方法.它不仅可以对凝聚相分子复杂动力学过程进行直接测量,还可以测量不同电子态、电子态-振动态之间的量子相干过程.2.07年,Flemming课题组利用二维电子光谱于低温77 K的条件下在捕光天线蛋白Fenna-Matthews-Olson中发现了能量传递过程存在量子相干现象.尽管后续的实验研究表明,该体系中实验观测到的量子相干现象不可能是由单纯的电子态相干引起的,然而这一实验现象的报道极大地激发了人们对天然或人工模拟光合系统中存在量子相干传能途径的探索,目前还是一个相当活跃的研究领域.本文旨在通过介绍二维电子光谱学原理、装置及其在光合作用体系能量传递中量子相干现象的应用,使二维电子光谱这种实验方法能够在更多的研究领域得以普及与推广.

关键词：二维电子光谱量子相干

利用飞秒宽带荧光光谱仪揭示光合细菌反应中心原初过程

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Chinese Journal of Chemical physics 2023年第6期36卷 655-663,I0055页

作者：刘鹤元甄张赫彭凌峰陈海龙翁羽翔中国科学院物理研究所软物质物理实验室北京100190 中国科学院大学物理学院北京100049 松山湖材料实验室东莞523808

本文为深入了解光合细菌反应中心内的高效能量转换机制,采用飞秒宽带荧光光谱技术,研究了室温下光合细菌反应中心中光诱导能量转移和电荷分离的动力学过程.得益于此技术的宽带光谱测量能力,直接确认了与细菌叶绿素B和P相关的两种不同的... 详细信息

本文为深入了解光合细菌反应中心内的高效能量转换机制,采用飞秒宽带荧光光谱技术,研究了室温下光合细菌反应中心中光诱导能量转移和电荷分离的动力学过程.得益于此技术的宽带光谱测量能力,直接确认了与细菌叶绿素B和P相关的两种不同的瞬态荧光组分,其Stokes位移分别确定为约197和450cm^(-1).通过对荧光发射动力学的拟合,揭示了从细菌脱镁叶绿素H到细菌叶绿素B(98 fs)和从细菌叶绿素B到细菌叶绿素P(170 fs)的超快能量转移过程.值得注意的是,预期亚2.0 fs的细菌叶绿素B荧光寿命被显著延长至约400 fs,表明B的电子激发态与P的电子振动态之间可能存在一-定的耦合,并对能量转移过程有潜在的促进作用.上述发现将有助于人们进一步理解电子振动耦合动力学对光合反应中心内光诱导原初过程的影响机制.

关键词：细菌反应中心飞秒宽带荧光光谱仪能量转移电荷分离瞬态荧光