Exciton Band Mixing in Rhodopseudomonas viridis
The decomposition of the excitonically mixed optical absorption spectrum of Rps. viridis in component monomer bands is critically discussed. It is shown that the presence of crossproducts of transition moments in the expression for the dipole strength of the mixed band precludes a decomposition in band areas. In contrast, a vectorial presentation of the component dipole moments is shown to offer insight in the exciton make-up of the mixed band. It is proposed that the vector direct product of a component transition moment and that of the mixed band is an acceptable measure of the “contribution” of the component band to the mixed band. With this definition the so-called exciton component P(+) is shown to contribute for 45% to the 848 nm band of Rps. viridis.
Key wordsReaction centre Exciton mixing Dipole moment Dipole strength Rps. viridis
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- 10.V. Rosenbach-Belkin, J. R. E. Fisher, A. Scherz. J. Am. Chem. Soc. 1990, in press.Google Scholar