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High-resolution He-scattering apparatus for gas-surface interaction studies

Journal Article · · Rev. Sci. Instrum.; (United States)
DOI:https://doi.org/10.1063/1.1139041· OSTI ID:5240690
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A high-resolution apparatus designed for the study of elastic and inelastic scattering of thermal helium atoms from crystal surfaces is presented. The highly expanded He nozzle beam has an energy spread ..delta..E/E of about 1.4% and is collimated to 0.2/sup 0/. The angle subtended by the detector opening as seen from the sample is also 0.2/sup 0/. Beam intensities as low as 10/sup -6/ of the specular beam intensity from a low-temperature clean Pt(111) surface are detectable. Pseudorandom chopping with a resolution of 2.5 ..mu..s (flight path 790 mm) is used for time-of-flight (TOF) analysis of the scattered helium. The base pressure in the sample chamber is in the low 10/sup -11/ mbar. The capabilities of the apparatus are demonstrated for physisorbed Xe adlayers on Pt(111). The results presented are obtained by using He scattering in various modes: coherent inelastic, coherent elastic, and incoherent (diffuse) elastic. This technique allows for a nondestructive nearly exhaustive characterization of the thermodynamics, structure, and dynamics of physisorbed adlayers on arbitrary substrates.

Research Organization:
Institut fuer Grenzflaechenforschung und Vakuumphysik, Kernforschungsanlage Juelich, Postfach 1913, D-5170 Juelich, Germany
OSTI ID:
5240690
Journal Information:
Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 57:11; ISSN RSINA
Country of Publication:
United States
Language:
English

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Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ADSORPTION
ATOMIC BEAMS
BEAMS
ELASTIC SCATTERING
ELEMENTS
FLUIDS
GASES
HELIUM
INELASTIC SCATTERING
MATERIALS TESTING
NONDESTRUCTIVE TESTING
NONMETALS
RARE GASES
RESOLUTION
SAMPLE HOLDERS
SCATTERING
SORPTION
SORPTIVE PROPERTIES
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
SURFACES
TESTING
THERMODYNAMICS