Effects of postdosed species on preadsorbed CO on Fe(100): Adsorption site conversion caused by site competition

Journal Article · Thu Jul 26 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a074· OSTI ID:6331608

Lu, Jiongping; Albert, M R; Bernasek, S L ^[1]

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1. Princeton Univ., NJ (USA)

Carbon monoxide (CO) adsorption on the clean Fe(100) surface and the c(2{times}2)CO-Fe(100) surface has been studied. The effects of postdosed oxygen(O{sub 2}) and methanethiol (CH{sub 3}SH) on preadsorbed CO were examined. These studies were performed under ultrahigh-vacuum(UHV) conditions, using high-resolution electron energy loss spectroscopy (HREELS), temperature-programmed desorption spectroscopy (TPD), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED). For CO, four associative adsorption states and one dissociative adsorption state were identified. Postdosed species were found to cause 4-fold hollow site CO molecules to migrate into lower coordination sites. This type of adsorption site conversion is discussed in terms of adsorption site competition between preadsorbed species and postdosed species.

• OSTI ID: 6331608
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
IRON
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAHIGH VACUUM