Abstract
Adsorption of CO at 90 K on molecular beam epitaxially grown Fe films on Cu(1 1 1) has been investigated using IR reflection absorption spectroscopy (IRRAS). Reflection high energy electron diffraction images reveal Fe films up to 4 ML (monolayer) thickness have an fcc(1 1 1) structure and a mixture of fcc(1 1 1) and bcc(1 1 0) structures for 4-8 ML thick films. A bcc(1 1 0) structure dominates the films beyond 8 ML in thickness. The C-O stretching frequency at saturation coverages observed by IRRAS represents these structural differences clearly. For 1-4 ML thick fee Fe films C-O stretch is located at 2000 cm-1 and the 6-8 ML thick films yield two C-O stretch bands at 2000 and 2032 cm-1, the latter of which is dominant for films more than 10 ML thick.
Original language | English |
---|---|
Pages (from-to) | 1-8 |
Number of pages | 8 |
Journal | Surface Science |
Volume | 472 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2001 Jan 20 |
Keywords
- Carbon monoxide
- Chemisorption
- Copper
- Infrared absorption spectroscopy
- Iron
- Molecular beam epitaxy
- Reflection high-energy electron diffraction (RHEED)
- Surface structure, morphology, roughness, and topography
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry