Abstract
Infrared absorption spectra for physisorbed methanol at 90 K on silver films of mass thicknesses 4-20 nm, deposited in UHV onto Ge substrate surfaces at 473 K, have been measured at normal incidence of radiation. The results show that the absorption intensity of the methanol C-O stretch mode depends on the mass thickness of silver film and methanol exposure. The absorption intensity obtained with an 8 nm thick silver film is about 60 times larger than the intensity observed without silver. Independent of silver thickness, the intensity is a maximum at an exposure less than 1 L, but a substantial enhancement (5-10 times) is observed at 5 L. This aspect makes it likely that the enhancement is due to an electromagnetic field enhancement caused by the collective electron resonances of the silver islands. The absorption enhancement features are correlated with the morphologies of the silver films.
| Original language | English |
|---|---|
| Pages (from-to) | 261-266 |
| Number of pages | 6 |
| Journal | Surface Science |
| Volume | 433 |
| DOIs | |
| Publication status | Published - 1999 Aug 2 |
| Externally published | Yes |
| Event | Proceedings of the 1998 14th International Vacuum Congress(ICV-14), 10th Conference on Solid Surfaces(ICSS-10), 5th Conference on Nanometre-scale Science and Technology(NANO-5), 10th International Conference on Quantitative Surface Analysis(QSA-10) - Birmingham, UK Duration: 1998 Aug 31 → 1998 Sep 4 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry