Direct observation and hole burning of the lowest exciton level (B870) of the LH2 antenna complex of Rhodopseudomonas acidophila (strain 10050)

Journal Article · Thu Jan 23 04:00:00 EST 1997 · Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

DOI:https://doi.org/10.1021/jp962766k· OSTI ID:501917

Wu, H M; Reddy, N R.S.; Small, G J ^[1]

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1. Ames Lab., IA (United States)

The results of 4.2 K absorption and hole-burning experiments on the B850 absorption band of isolated LH2 antenna complexes from Rhodopseudomonas acidophila are presented for samples that exhibited a B850 absorption band of sufficient narrowness that allows direct observation of the lowest exciton level of the B850 ring of dimers as a weak but distinct shoulder at the red edge of the B850 band. The diagonal and/or off-diagonal energy disorder within the B850 ring is proven to be important in understanding B870 and the electronic structure of B850. Data pertaining to the pure dephasing of the B870 exciton level are presented and are interpreted in terms of scattering due to imperfections in the B850 ring. 24 refs., 6 figs.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 501917
• Journal Information: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 4 Vol. 101; ISSN 1089-5647; ISSN JPCBFK
• Country of Publication: United States
• Language: English

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