Abstract
Sub-picosecond, time-resolved absorption spectra of all- trans-neurosporene, both free in n-hexane solution and bound to the LH2 complex from Rhodobacter sphaeroides G1C, were recorded and analyzed by singular-value decomposition followed by global fitting using a sequential model. The former experiment identified the 1B u +→1B u −→2A g − internal conversion, whereas the latter experiment identified a transformation of 1B u +→2A g −→T 1(1 3B u +). Excitation to the 1B u +(0) or 1B u +(1) vibronic level resulted in enhancement of stimulated emission from the particular level, showing that vibrational relaxation in the 1B u + state has a time constant comparable to, or larger than, that of electronic relaxation.
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