氧气诱导单分子电子转移的动力学特性  

Oxygen-Induced Electron Transfer Dynamic Characteristics of Single Molecules

作　　者：吴瑞祥[1,2] 陈瑞云[1,2] 乔志星 高岩[1,2] 张国峰[1,2] 秦成兵[1,2] 肖连团[1,2] 贾锁堂[1,2] 

机构地区：[1]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [2]极端光学协同创新中心,山西太原030006

出　　处：《激光与光电子学进展》2017年第5期346-352,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61527824;11434007;11374196;11404200;11504216;U1510133);教育部创新团队发展计划(IRT13076);山西省应用基础研究计划(201601D021016);山西省留学回国人员科技活动择优资助项目

摘　　要：通过测量单分子荧光亮态、暗态持续时间的概率密度统计特性,研究了氧气含量对单分子电子转移动力学特性的影响。在富氧环境下,单分子荧光闪烁由离子态的电子布居引起,呈现幂律分布;在贫氧环境下,单分子荧光闪烁主要源于三重态的电子布居,呈现指数截止型幂律分布;在特定氧气环境下,两种电子转移过程呈现明显的竞争效应,部分单分子荧光闪烁服从幂律分布,其余单分子荧光闪烁服从指数截止型幂律分布。By measuring the probability density statistical characteristics of the duration time of single molecules fluorescence at on-and off-states, the effect of oxygen concentration on electron transfer dynamic characteristic of single molecules is studied. In the oxygen-rich environment, the fluorescence blinking of single molecules is caused by the electron population of ionic state and presents a power-law distribution. In the oxygen-poor environment, the fluorescence blinking of single molecules mainly stems from the electron population of triplet state and presents an exponential truncated power-law distribution. In the oxygen-specific environment, two kinds of electron transfer processes show an apparent competition effect, where part fluorescence blinking of single molecules follows a powerlaw distribution while the other part follows an exponential truncated power-law distribution.

关 键 词：光谱学 单分子 氧气 电子转移 荧光闪烁 概率密度分布 

分 类 号：O561[理学—原子与分子物理]