title: Stark Absorption Spectroscopy of Peridinin and Allene-Modified Analogues.
abstract: Stark absorption spectra of peridinin (Per) and five allene-modified analogues and their angular dependence as a function of an externally applied electric field were measured in methyl methacrylate polymer at 77K. In all cases, the energetically lowest absorption band has a significant change of static dipole moment upon photoexcitation (Δμ). In particular, Per has the largest value of |Δμ|. The angles between Δμ and the transition dipole moment of all the analogues were determined. It is suggested that the allene group in Per plays a key role as the electron donor in the charge transfer process following photoexcitation. The results of MNDO-PSDCI calculations support this idea.
authors.affiliation: Department of Physics and CREST-JST, Graduated School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kusumoto
authors.forename: Tomoko
authors.initials: T
authors.lastname: Horibe
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kajikawa
authors.forename: Shinji
authors.initials: S
authors.lastname: Hasegawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Iwashita
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Cogdell
authors.forename: Robert R
authors.initials: RR
authors.lastname: Birge
authors.forename: Harry A
authors.initials: HA
authors.lastname: Frank
authors.forename: Shigeo
authors.initials: S
authors.lastname: Katsumura
authors.forename: Hideki
authors.initials: H
authors.lastname: Hashimoto