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DS: Dünne Schichten

DS 9: Charakterisierungsverfahren II

DS 9.1: Fachvortrag

Monday, March 22, 1999, 14:00–14:15, H 55

Bandenverschiebungen in der Infrarot Spektroskopie an gemischten Monolagen — •D. Kurth and A. Ulman — Max-Planck-Institut fuer Kolloid- und Grenzflaechenforschung, Rudower Chaussee 5, D-12489 Berlin (Adlershof)

<fontfamily><param>Times</param>Optically induced band shifts in reflection-absorption infrared spectra (RAIR) of mixed self-assembled monolayers (SAMs) are reported. SAMs of 4-trifluoromethyl-4- mercaptobiphenyl dispersed in 4’-methyl-4-mercapto-biphenyl on gold exhibit significant shifts of the spectral envelope of the symmetric CF3-stretch and the b1u skeletal mode. A linear relationship is observed between the band positions, the band intensity and the surface CF3 group concentration. To rationalize the observed changes in band positions and shapes, a classical electromagnetic theory approach is used, providing an excellent agreement between theory and experiments. The simplified RAIR-signature of 4’-trifluoromethyl-4-mercaptobipbenyl on gold is a unique example of the surface selection rule..</fontfamily> Text, genau einmal