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Science 18 August 1995:
Vol. 269. no. 5226, pp. 935 - 939
DOI: 10.1126/science.7638615
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Articles

Science, Vol 269, Issue 5226, 935-939
Copyright © 1995 by American Association for the Advancement of Science

articles

Resonance light scattering: a new technique for studying chromophore aggregation

RF Pasternack and PJ Collings

Department of Chemistry, Swarthmore College, PA 19081, USA.

Light scattering experiments are usually performed at wavelengths away from absorption bands, but for species that aggregate, enhancements in light scattering of several orders of magnitude can be observed at wavelengths characteristic of these species. Resonance light scattering is shown to be a sensitive and selective method for studying electronically coupled chromophore arrays. The approach is illustrated with several examples drawn from porphyrin and chlorin chemistry. The physical principles underlying resonance light scattering are discussed, and the advantages and limitations of the technique are reviewed.


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