The study of photo-induced ultrafast dynamics in light-harvesting complex LH2 of purple bacteria

Liu, Weimin; Yan, Yongli; Liu, Kangjun; Xu, Chunhe; Qian, Shixiong

doi:10.1007/s11467-006-0022-z

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A Dynamics Of a Single B850 Ring1

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2009

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“…4͑a͒ and 4͑b͒ for the fast population transfer and the longer build-up of the coherence. Similar biexponential time scales are noted in spectroscopic experiments for LH2 15,18,50,51 as well as LH1. 52,53 The steady-state populations at t = 5 ps are shown in Fig.…”

Section: A Dynamics Of a Single B850 Ringsupporting

confidence: 79%

Light harvesting complex II B850 excitation dynamics

Strümpfer¹,

Schulten²

2009

The Journal of Chemical Physics

158

258

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The dynamics of excitation energy transfer within the B850 ring of light harvesting complex 2 from Rhodobacter sphaeroides and between neighboring B850 rings is investigated by means of dissipative quantum mechanics. The assumption of Boltzmann populated donor states for the calculation of intercomplex excitation transfer rates by generalized Förster theory is shown to give accurate results since intracomplex exciton relaxation to near-Boltzmann population exciton states occurs within a few picoseconds. The primary channels of exciton transfer between B850 rings are found to be the five lowest-lying exciton states, with non-850 nm exciton states making significant contributions to the total transfer rate.

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