Abstract
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-mercaptobiphenyl 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-mercaptobiphenyl on gold is a unique example of the surface selection rule.
Original language | English (US) |
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Pages (from-to) | 5555-5559 |
Number of pages | 5 |
Journal | Langmuir |
Volume | 15 |
Issue number | 17 |
DOIs | |
State | Published - Aug 17 1999 |
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Surfaces and Interfaces
- Spectroscopy
- Electrochemistry