Structure of atomic sulfur overlayers on the Mo(001) surface using low energy alkali ion scattering
Conference
·
OSTI ID:5995399
Studies of adsorption of S on Mo have been motivated by interest in modification of surface reactivity by adsorbate atoms and in sulfided metal surfaces which may serve as models for sulfide hydrodesulfurization catalysts. The system of S on Mo(001) has been studied previously by Clarke and more recently by Salmeron et.al. It has been postulated that at sub-monolayer coverages the S adsorbs on top of the Mo(001) filling four-fold hollow sites, and that ordering in the overlayer is responsible for the sequence of LEED patterns observed with increasing S coverage. We have applied low energy K/sup +/ and Li/sup +/ ion scattering to test these structural models. Experimental details and cleaning procedures for the Mo(001) crystal are as in previous studies. A solid state electrochemical cell was used to dose the sample witH S/sub 2/. The resulting surface was also characterized by LEED and AES. Our LEED-AES results are essentially in agreement with those of Salmeron et.al. 2 references, 1 figure.
- Research Organization:
- Oak Ridge National Lab., TN (USA); Northwestern Univ., Evanston, IL (USA). Dept. of Chemistry
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5995399
- Report Number(s):
- CONF-841218-18; ON: DE85005280
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADSORPTION
BACKSCATTERING
CHARGED PARTICLES
COHERENT SCATTERING
COLLISIONS
CRYSTALS
DATA
DIFFRACTION
ELECTRON DIFFRACTION
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 100-1000
EXPERIMENTAL DATA
INFORMATION
ION COLLISIONS
IONS
LITHIUM IONS
METALS
MOLYBDENUM
MONOCRYSTALS
NONMETALS
NUMERICAL DATA
POTASSIUM IONS
SCATTERING
SORPTION
SORPTIVE PROPERTIES
SULFUR
SURFACE PROPERTIES
TRANSITION ELEMENTS
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADSORPTION
BACKSCATTERING
CHARGED PARTICLES
COHERENT SCATTERING
COLLISIONS
CRYSTALS
DATA
DIFFRACTION
ELECTRON DIFFRACTION
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 100-1000
EXPERIMENTAL DATA
INFORMATION
ION COLLISIONS
IONS
LITHIUM IONS
METALS
MOLYBDENUM
MONOCRYSTALS
NONMETALS
NUMERICAL DATA
POTASSIUM IONS
SCATTERING
SORPTION
SORPTIVE PROPERTIES
SULFUR
SURFACE PROPERTIES
TRANSITION ELEMENTS