LASER-INDUCED BACTERIORHODOPSIN LB FILMS FAST PHOTOELECTRIC DYNAMICS

Ten layers of oriented bacteriorhodopsin (BR) LB films are prepared on ITO conductive glass to constitute an ITO electrode/BR LB films/KCl s olution/Cu electrode wet photocell. A a-switched double frequency Nd:Y AG laser with 10 Hz repetitive rate and 8 ns pulse width is used to ex cite the BR LB films. The photoelectric signal is directly captured by a 300 MHz digitizing oscilloscope. A theory on the BR photoelectric d ynamics is established. By nonlinear least square fitting of the exper imental culves acquired at different time bases, the experimental equa tion corresponding to the theoretical model is obtained, and the charg e displacements and the decay time constants for each Step in the BR p hotocycle are calculated.