title: Electronic interactions in a branched chromophore investigated by nonlinear optical and time-resolved spectroscopy.
abstract: The third order nonlinear optical properties of a trimer branched chromophore system and its linear molecule analog are investigated. Two-photon absorption and degenerate four wave mixing measurements were carried out on both systems. An enhancement in the nonlinear optical effect is observed for the branched trimer molecule in comparison to the linear chromophore system. Ultrafast time-resolved measurements were carried out to probe the excited state dynamics in the branched structures. The time-resolved measurements suggest that the two important processes affecting the nonlinear optical properties in the trimer system, charge transfer stabilization and initial electronic delocalization, occur on two different time scales.
authors.affiliation: Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
authors.forename: Sridhar Arun
authors.initials: SA
authors.lastname: Lahankar
authors.forename: Richard
authors.initials: R
authors.lastname: West
authors.forename: Oleg
authors.initials: O
authors.lastname: Varnavski
authors.forename: Xingbin
authors.initials: X
authors.lastname: Xie
authors.forename: T
authors.initials: T
authors.lastname: Goodson
authors.forename: Ludmila
authors.initials: L
authors.lastname: Sukhomlinova
authors.forename: Robert
authors.initials: R
authors.lastname: Twieg