Adsorption and photodecomposition of Mo(CO)[sub 6] on Si(111) 7[times]7: An infrared reflection absorption spectroscopy study
- Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
The adsorption and photodecomposition of Mo(CO)[sub 6] adsorbed on Si(111) 7[times]7 surfaces has been studied with Auger electron spectroscopy, temperature programmed desorption, low energy electron diffraction and infrared reflection absorption spectroscopy in a single external reflection configuration. The external-reflection technique is demonstrated to have adequate sensitivity to characterize submonolayer coverages of photogenerated Mo(CO)[sub [ital x]] fragments. It is proposed that the first layer of Mo(CO)[sub 6] adsorbs in ordered islands with a Mo(CO)[sub 6] atop each adatom of the 7[times]7 reconstructed Si surface. UV irradiation of these islands produces a carbonyl fragment, identified as chemisorbed Mo(CO)[sub 5]. The Mo(CO)[sub 5] thermally decarbonylates via two subcarbonyl intermediates with little CO dissociation. Photolysis of thicker layers results in the formation of Mo[sub [ital x]](CO)[sub [ital y]] dimers/polymers, as evidenced by the appearance of bridging CO, which is attributed to a facile association reaction. The dimer/polymer species correlate with deposition of C and O on the surface.
- DOE Contract Number:
- AI05-84ER13150
- OSTI ID:
- 5343570
- Journal Information:
- Journal of Chemical Physics; (United States), Vol. 100:4; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBONYLS
ADSORPTION
MOLYBDENUM COMPOUNDS
SILICON
SORPTIVE PROPERTIES
ABSORPTION SPECTROSCOPY
AUGER ELECTRON SPECTROSCOPY
DECOMPOSITION
DESORPTION
ELECTRON DIFFRACTION
INFRARED SPECTRA
PHOTOCHEMICAL REACTIONS
ULTRAVIOLET RADIATION
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SCATTERING
SEMIMETALS
SORPTION
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
400500* - Photochemistry