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Communication: Uncovering molecule-TiO2 interactions with nonlinear spectroscopy
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Femtosecond transient grating experiments are used to investigate electronic structures and transport mechanisms in dye-sensitized nanocrystalline TiO2 films. This study examines two molecular sensitizers spanning the weak (a phosphonated Ruthenium complex) and strong (catechol) molecule-TiO2 coupling regimes. It is shown that strong molecule-TiO2 interactions give rise to photoinduced vibrational coherences at the interface between species. We suggest that the amplitudes of these coherences reflect the molecule-TiO2 coupling strength and signify the delocalization of excited statewavefunctions.
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