The formation of the dimer radical cation (D*+) of 4-(methylthio) benzoic acid on a TiO2 surface is demonstrated using the time-resolved diffuse reflectance technique. The observed time-resolved diffuse reflectance spectral shape significantly depends on the substrate concentrations. The substrate concentration dependences of the initial transient signal intensity (%abs.(t=0)) and the amount of adsorbates (n(ad)) clearly suggest that the formation of D*+ is attributableto the high local substrate concentration on the TiO2 surface. The electronic influence of substituents on the formation of D*+ is also discussed.
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