title: Effect of aggregation on the excited-state electronic structure of perylene studied by transient absorption spectroscopy.
abstract: The effect of aggregation on the excited-state electronic structure of perylene was studied through transient absorption measurements of isolated molecules, excimers, monomeric crystals (beta-perylene), and dimeric crystals (alpha-perylene). Changes of electronic state were clearly identified from the changes in transient absorption spectra. A detailed investigation was made by combining the obtained results with previous measurements of ground-state absorption and fluorescence spectra. The energy level of the ion-pair state in alpha-perylene crystals was estimated, and the results are compared with previous photoconductivity results. Moreover, the relaxation processes of excited states in alpha-perylene crystals were studied by femtosecond transient absorption measurements.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Furube
authors.forename: Miki
authors.initials: M
authors.lastname: Murai
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Watanabe
authors.forename: Ryuzi
authors.initials: R
authors.lastname: Katoh