Energy Transfer Pathways in Reaction Centre upon Femtosecond Excitation of Accessory Bacteriochlorophylls

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（4）
• 所属期刊栏目: ATOMIC AND MOLECULAR PHYSICS
• 页码范围: 522-524
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

The energy transfer pathways from the excited accessory bacteriochlorophylls (B*) within native and modified(pheophytin-exchanged) reaction centres isolated from Rhodobacter sphaeroides (RS601) have been investigatedby using the femtosecond pump-probe technique. For native RS601, B* decays with a time constant of 240 fs, followed by a partial recovery of the ground-state bleaching with a tirnescale of about 2ps. In modified RS601 (Phe),.however, B* decays with a time constant of 800rs for magic angle (54.7°) polarization configuration. In additionto the general assumption of energy transfer pathway from B* to the special pair P, an alternative pathway forenergy transfer probably operates as well.