Surface-Enhanced Infrared Spectroscopy: The Origin of the Absorption Enhancement and Band Selection Rule in the Infrared Spectra of Molecules Adsorbed on Fine Metal Particles
- 1 September 1993
- journal article
- research article
- Published by SAGE Publications in Applied Spectroscopy
- Vol. 47 (9), 1497-1502
- https://doi.org/10.1366/0003702934067478
Abstract
Infrared transmission spectra of molecules adsorbed on silver island films evaporated on CaF2 have been investigated. The spectra are remarkably simple compared with those of the molecules in the solid state (KBr pellets). Only the vibrational modes which give dipole changes perpendicular to the metal surface are infrared active. In addition, their intensities are about 200 times larger than those of the free molecule. These results can be fully accounted for if the electric field which excites the surface molecule is perpendicular to the local surface of the metal islands and is stronger than the incident electric field. The origin of the absorption enhancement and the surface selection rule is discussed theoretically by using a classical electromagnetic model.Keywords
This publication has 22 references indexed in Scilit:
- Surface-enhanced infrared external reflection spectroscopy at low reflective surfaces and its application to surface analysis of semiconductors, glasses, and polymersAnalytical Chemistry, 1993
- Electromagnetic mechanism of enhanced infrared absorption of molecules adsorbed on metal island filmsSurface Science, 1992
- Surface-enhanced infrared absorption of p-nitrobenzoic acid deposited on silver island films: contributions of electromagnetic and chemical mechanismsThe Journal of Physical Chemistry, 1991
- Qualitative Analysis of Nanogram Samples with Fourier Transform Infrared Transmission Surface Electromagnetic Wave SpectroscopyApplied Spectroscopy, 1990
- Intensity enhancement of infrared attenuated total reflection spectra of stearic acid Langmuir-Blodgett monolayers with evaporated silver island filmsLangmuir, 1987
- Infrared absorption enhancement of monolayer species on thin evaporated Ag films by use of a Kretschmann configuration: Evidence for two types of enhanced surface electric fieldsApplied Physics A, 1984
- Infrared reflection-absorption spectroscopy of adsorbed moleculesSurface Science Reports, 1983
- Surface Enhanced Raman ScatteringPublished by Springer Science and Business Media LLC ,1982
- Enhancement of the Infrared Absorption from Molecular Monolayers with Thin Metal OverlayersPhysical Review Letters, 1980
- Free radical studies by resonance Raman spectroscopy. Part 3.—4-Nitrobenzoate radical DianionJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1978