Dynamics and structure of chemisorbed CO on Cu(110): An electron-stimulated desorption ion angular distribution study

Journal Article · Wed May 01 04:00:00 EDT 1996 · Journal of Vacuum Science and Technology, A

DOI:https://doi.org/10.1116/1.580300· OSTI ID:434625

Ahner, J ^[1]; Mocuta, D; Ramsier, R D ^[2]; Yates, Jr, J T ^[1]

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1. Department of Chemistry, University of Pittsburgh, Surface Science Center, Pittsburgh, Pennsylvania 15260 (United States)
2. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)

The adsorption of CO on a Cu(110) surface has been studied in the temperature range between 32 K and 200 K by the ESDIAD (electron-stimulated desorption ion angular distribution) technique. Here a desorbing neutral excited CO{asterisk} species is spatially imaged. At coverages up to {theta}=0.2, a pronounced anisotropy in the librational motion of CO adsorbed in the atop configuration has been observed. The higher amplitude of libration is along the copper atom rows ([1{bar 1}0]-direction). Large changes in the observed CO{asterisk} pattern in the low temperature range between 32 K and 70 K give an indication of a shallow potential well and the thermal population of the higher librational levels. With increasing CO coverage three distinct ESDIAD patterns are observed. Starting from a single normal beam with an elliptical cross-section having the major axis in the [1{bar 1}0]-direction for coverages up to 0.2 monolayer (ML), a transformation of the ESDIAD pattern into two separated beams is observed for a coverage of about 0.5 ML, indicating a tilting of the molecules in the [1{bar 1}0]-directions. With further CO coverage increase, an additional central beam grows with a slight elliptical broadening in the [001]-direction. Based on ESDIAD and digital low-energy electron diffraction measurements, a linear-chain model for CO adsorption on atop sites of Cu(110) is proposed. {copyright} {ital 1996 American Vacuum Society}

• OSTI ID: 434625
• Report Number(s): CONF-9510385--
• Journal Information: Journal of Vacuum Science and Technology, A, Journal Name: Journal of Vacuum Science and Technology, A Journal Issue: 3 Vol. 14; ISSN 0734-2101; ISSN JVTAD6
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CARBON MONOXIDE
CHEMISORPTION
COPPER
ELECTRON STIMULATED DESORPTION
SORPTIVE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
VIBRATIONAL STATES