Differences in the neutralization of 2. 4--10 keV Ne[sup +] scattered from the Cu and Au atoms of an alloy surface

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.774· OSTI ID:6464041

Buck, T M ^[1]; Wallace, W E ^[2]; Baragiola, R A ^[3]; Wheatley, G H ^[4]; Rothman, J B ^[5]

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1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272 (United States) Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6202 (United States) AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
2. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272 (United States) Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6202 (United States)
3. Laboratory for Atomic and Surface Physics, Engineering Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
4. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
5. Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania

The neutralization behavior of low-energy Ne[sup +] ions scattered from a compositionally ordered Cu[sub 3]Au(100) surface has been studied over a range of incident energy [ital E][sub 0] from 2.4 to 10 keV. Ion fractions of Ne scattered from Cu atoms in the first, or first two, atom layers exhibited a sharp increase setting in at an [ital E][sub 0] of 4--5 keV, reaching 70% at 10 keV for first-layer scattering. Inelastic energy losses, up to 130 eV, and Auger electron emission from Ne scattered from Cu, were also observed at incident energies above 4 keV. Ne scattered from the Au atoms on the same Cu[sub 3]Au(100) surface showed only the usual velocity-dependent Auger and resonance neutralization. An explanation of the Cu results is given in terms of Ne 2[ital s] vacancy creation during the close collision of Ne, which is neutralized on the inward path, followed by autoionization on the outward path after scattering into the vacuum. Conversely, Ne cannot approach Au closely enough to form an appropriate inner-shell vacancy. This is due to the higher Coulombic repulsion created by the greater charge of the Au nucleus.

• DOE Contract Number: FG02-85ER13350
• OSTI ID: 6464041
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
664300 -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CHARGED PARTICLES
COPPER ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ENERGY LOSSES
ENERGY RANGE
GOLD ALLOYS
INELASTIC SCATTERING
ION-NEUTRALIZATION SPECTROSCOPY
IONS
KEV RANGE
KEV RANGE 01-10
LOSSES
MONOCRYSTALS
NEON IONS
POINT DEFECTS
SCATTERING
SPECTROSCOPY
SURFACES
VACANCIES