New developments in IR surface vibrational spectroscopy

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:179184

Hirschmugl, C J; Lamont, C L.A.; Williams, G P ^[1]

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1. Brookhaven National Lab., Upton, NY (United States). National Synchrotron Light Source

Low frequency dynamics at surfaces, particularly in the region of the adsorbate-substrate vibrational modes is of fundamental importance in areas as varied as sliding friction, catalysis, corrosion and epitaxial growth. This paper reviews the new developments in low frequency Infrared Reflection Absorption Spectroscopy using synchrotron radiation as the source. Absolute changes induced in the far infrared for several adsorbate systems on Cu, including CO and H, are dominated by broadband reflectance changes and dipole forbidden vibrational modes which in some cases are an order of magnitude stronger than the dipole allowed modes. The experimental data can be explained by a theory developed by Persson, in which the dielectric response of the substrate is seen as playing a crucial role in the dynamics. In particular the relationships between the wavelength of the light, the penetration depth and the electron mean-free path, are critical.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 179184
• Report Number(s): BNL--62540; CONF-951030--6; ON: DE96004196
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ABSORPTION SPECTROSCOPY
ADSORPTION
CARBON MONOXIDE
CHEMICAL SHIFT
COPPER
HYDROGEN
INFRARED RADIATION
OSCILLATION MODES
PERFORMANCE
RESOLUTION
SORPTIVE PROPERTIES