A view of fast charge separation in the bacterial photosynthetic reaction centre involving weak environmental damping of a populated auxiliary chlorophyll state
✍ Scribed by Jan M. Hammerstad-Pedersen; Marianne H. Jensen; Yurij I. Kharkats; Aleksandr M. Kuznetsov; Jens Ulstrup
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 524 KB
- Volume
- 205
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The initial fast electrical charge separation in the bacterial photosynthetic reaction centre involves electron transfer (ET) from the photo-excited special pair chlorophyll to pheophytin. The ET is assisted by the auxiliary chlorophyll monomer which may be populated in the sub-picosecond time range. We provide a new theoretical description of this process which rests on three-level coherent ET theory, incorporating environmental damping and partial vibrational relaxation in the intemxdiate state of auxiliary chlorophyll population. If damping is not too strong, this view offers a clue to the ultrafast, activationless and possibly coherent character of both steps, also in the limit when the electronic coupling between the three molecular entities is weak.