光捕集性アンテナ部品分子のコヒーレントフォノン

概要

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We have investigated coherent phonons in trans-stilbene, which is one of the light-harvesting (LH) antenna component molecules of LH-dendrimers. In the LH-dendrimers, low frequency vibrational modes in the LH-antenna subunits play an important role in the energy transfer processes from the photo-excited antenna to the core. In order to clarify these vibrational modes, we built a coherent phonon detecting system by using a mode-licked Ti: sapphire laser. By using this system, we found a complex transient response signal of the transmitted probe-pulse around at the time origin. In the fast Fourier transform spectrum of this transient response, four vibrational modes less than 20 THz are resolved. On the basis of vibrational mode analyses by semi-empirical molecular orbital calculation, we discussed the origins of these vibrational modes.
2011-03-00