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Polland, Hans-Joachim and Franz, M. A. and Zinth, Wolfgang and Kaiser, Wolfgang and Hegemann, P. and Oesterhelt, Dieter (1985): Picosecond events in the photochemical cycle of the light-driven chloride-pump halorhodopsin. In: Biophysical Journal, No. 47: pp. 55-59
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Abstract

The early events in halorhodopsin after light excitation are studied with picosecond time resolution. Absorption and fluorescence measurements show that the electronically excited state of the incorporated retinal has a lifetime of 5 ps. Within that time a red-shifted photoproduct is formed that remains stable for at least 2 ns.