Experimental Physics IV, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany.
Chemphyschem. 2011 Feb 25;12(3):711-6. doi: 10.1002/cphc.201000588. Epub 2010 Oct 22.
We investigate fluorescence blinking of individual RC-LH1 (reaction-centre-light-harvesting 1) complexes from the photosynthetic purple bacterium Rhodopseudomonas palustris. For both the on- and off-periods the telegraph-like intermittency of the fluorescence intensity follows power-law statistics with exponents between 1 and 2. Yet, this behaviour was only observed for a small fraction of the complexes studied. We argue that the majority of the complexes reside in a prolonged on-state, due to a mechanism that is similar to the Coulomb blockade in semiconductor quantum dots, and which results here from the photoinduced charges located within the RC upon photoexcitation of the LH1 antenna.
我们研究了来自光合紫色细菌沼泽红假单胞菌的单个 RC-LH1（反应中心-光捕获 1）复合物的荧光闪烁。对于 ON 和 OFF 周期，荧光强度的类似电报的间歇性遵循幂律统计，指数在 1 到 2 之间。然而，这种行为仅在研究的一小部分复合物中观察到。我们认为，由于类似于半导体量子点中的库仑阻塞的机制，大多数复合物处于延长的 ON 状态，这导致在 LH1 天线光激发时，RC 内的光致电荷位于 RC 内。
