细菌视紫红质三阶非线性光感应超快过程研究

用前向立体筒并四波混频实验对光能转换生物分子细菌视紫红质（bR)作三阶非线性光学超快过程研究，观察到时间响应由快成份和慢成份组成，用激子们相空间充满理论和构形变化模型分别给予动力学机制解释，快成份对应于自由电子－空穴对形成的激子，慢居份对应于无辐射衰变形成的极化子，通过对实验曲线的数学拟合，得到激子饱和密度和激子长度，激子和极化子寿命，以及极化子形成效率等动力学参数。

PHOTO-INDUCED ULTRAFAST PROCESS OF THIRD-ORDER OPTICAL NONLINEARITY IN BACTERIORHODOPSIN

Photo induced ultrafast process in bacteriorhodopsin was observed with DFWM technique. The origin of the fast component(ps) and the slow component (ns) in photo excitation dynamics was explained on the basis of models of both the phase space filling and the conformational deformation. The former is due to the excitons made from free electron hole pairs and the latter is owing to the polaron induced from the non radiative decay. The saturation density and length of excitons, the life time of exciton and polaron, and the polaron state formation efficiency were extracted by a least square fitting procedure.