Journal
CHEMICAL PHYSICS LETTERS
Volume 461, Issue 4-6, Pages 305-309Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2008.07.023
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The accuracy of Forster theory for measuring short donor-acceptor distances in a small chromophore pair is examined. Small chromophores are much better suited for measuring short distances relative to large chormophores. Nonetheless, it is found that the Forster expression introduces errors for distances below 20 angstrom, overestimating for some orientations and underestimating for others. Fortuitous cancellation due to orientation disorder in experimental investigations may result in better agreement with Forster rate. Not only the size of the molecule, but more significantly, the spread of transition dipole density is found to be a limiting factor. (C) 2008 Elsevier B.V. All rights reserved.
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