PICOSECOND PUMP-PROBE SPECTROSCOPY OF DYES ON SURFACES: ELECTRONIC ENERGY RELAXATION IN AGGREGATES OF PSEUDOISOCYANINE ON COLLOIDAL SILICA.

Edward L. Quitevis, Miin Liang Horng, Sun Yung Chen

Research output: Contribution to journalArticle

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Abstract

Picosecond optical pump-probe spectroscopy was used to measure electronic energy relaxation in aggregates of pseudoisocyanine on 40-Angstrom-diameter colloidal silica particles. The adsorption of pseudoisocyanine on colloidal silica was accompanied by the appearance of a sharp band at 569 nm, called the J-band, in the absorption spectrum. The J-band arises from an optical transition to a single-exciton state of aggregates absorbed on colloids. Nonexponential signals obtained from transient optical bleaching of the J-band are discussed in terms of a polariton model.

Original languageEnglish
Pages (from-to)256-260
Number of pages5
JournalJournal of physical chemistry
Volume92
Issue number2
DOIs
StatePublished - Jan 1 1988

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