Molecular desorption of methyl halides from GaAs(110): The role of lateral dipole--dipole interaction between adsorbates
Journal Article
·
· Journal of Chemical Physics; (United States)
- Columbia Radiation Laboratory, Columbia University, New York, New York 10027 (United States)
Temperature programmed desorption (TPD) spectra of CH[sub 3]X (X=Cl, Br, I) from GaAs(110) were recorded with a heating rate of 5 K/s for coverages from less than 0.1 to 2 ML, where methyl halides desorb molecularly, i.e., without dissociation. The shapes of the TPD spectra are strongly coverage dependent with the peak temperature of desorption decreasing with increasing coverage, especially for the submonolayer region. A model incorporating dipole--dipole repulsive interactions between the adsorbed molecules and which was previously proposed for the desorption of adsorbed molecules from metal surfaces has been employed to fit our TPD spectra. The fit gives the activation energy, effective dipole moment, and effective polarizability for the adsorbate. The resulting dipole moment and polarizability are less than the gas-phase molecular values, suggesting the importance of an ordered adsorption orientation. [copyright] [ital 1994][ital American] [ital Institute] [ital of] [ital Physics].
- DOE Contract Number:
- FG02-90ER14104
- OSTI ID:
- 7177743
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 101:11; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ARSENIC COMPOUNDS
ARSENIDES
BROMINATED ALIPHATIC HYDROCARBONS
CHLORINATED ALIPHATIC HYDROCARBONS
COUPLING
DESORPTION
DIPOLES
DISSOCIATION
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HEATING RATE
IODINATED ALIPHATIC HYDROCARBONS
METHYL BROMIDE
METHYL CHLORIDE
METHYL IODIDE
MULTIPOLES
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
PNICTIDES
SATURATION
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ARSENIC COMPOUNDS
ARSENIDES
BROMINATED ALIPHATIC HYDROCARBONS
CHLORINATED ALIPHATIC HYDROCARBONS
COUPLING
DESORPTION
DIPOLES
DISSOCIATION
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HEATING RATE
IODINATED ALIPHATIC HYDROCARBONS
METHYL BROMIDE
METHYL CHLORIDE
METHYL IODIDE
MULTIPOLES
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
PNICTIDES
SATURATION
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES