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Stark Absorption Spectroscopy of Peridinin and Allene-Modified Analogues
Toshiyuki Kusumoto1, Tomoko Horibe, Takayuki Kajikawa
1Department of Physics and CREST-JST, Graduated School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
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 (Δmicro). In particular, Per has the largest value of |Δmicro|. The angles between Δmicro 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.
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