Abstract

Step-scan light-induced FT-IR difference spectra (1800-1200 cm⁻¹) of <i>Rhodobacter sphaeroides</i> photosynthetic bacterial reaction centers at low temperature and with a 10-μs time resolution are presented. The molecular changes and relaxation processes accompanying the photoxidation of the primary electron donor (<i>P</i>) are already present 10 μs after excitation. The photoconversion of <i>P</i> to the triplet state gives rise to characteristic IR absorption changes which decay with a half-time of 130 μs. A negative band at 1695 cm⁻¹ and a positive one at 1670 cm⁻¹ are assigned to the 9-keto carbonyl of bacteriochlorophyll in the states <i>P</i> and ³<i>P</i>, respectively.

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