Abstract
Halobacterium halobium contains at least two retinylidene protein units that show photoactivity. Bacteriorhodopsin, a light-driven proton pump, has been known for more than a decade and has been studied extensively. Halorhodopsin (or P588) was only discovered recently. Its light-driven pump acts on chlorine ions.1 Until now, the photoreaction cycle in halorhodopsin was studied on a time scale of microseconds.2 We present the first known investigations on halorhodopsin on a picosecond time scale.
© 1984 Optical Society of America
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