Phys. Rev. E 69, 032902 (2004) [4 pages]Low-lying excited states of light-harvesting system II in purple bacteriaReceived 10 January 2003; revised 25 September 2003; published 31 March 2004 The low-lying excited states of a B850 ring of Rhodospirillum (Rs.) molischianum are determined accurately by a semiempirical INDO/S method. Results obtained are found to fit extremely well with a Frenkel exciton model with long-range dipolar interactions, and the spatial size of the electron-hole pair is confirmed to fall predominantly within one bacteriochlorophyll with a small leakage to its nearest neighbors. More importantly, the nearest neighbor exciton coupling constants are found to be close to those evaluated directly from dimers, and thus, an existing discrepancy between calculated results of dimers and B850 rings has been resolved. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.69.032902
DOI:
10.1103/PhysRevE.69.032902
PACS:
87.15.-v, 87.16.Ac, 87.17.Aa
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.