Slow-particle-induced kinetic electron emission from a clean metal surface: A comparison for neutral and ionized projectiles

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.15· OSTI ID:6509787

Lakits, G; Arnau, A; Winter, H ^[1]

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1. Institut fuer Allgemeine Physik, Technische Universitaet Wien, Wiedner Haupstrasse 8-10, A-1040 Wien (Austria)

Electron emission from a clean gold surface bombarded by slow ({ital v}{lt}1 a.u.) neutral or singly charged atoms has been investigated both experimentally and theoretically. The determination of electron-emission statistics for 1--16-keV H{sup +}, H{sup 0}, H{sup {minus}}, He{sup +}, He{sup 0}, Ne{sup +}, Ne{sup 0}, Ar{sup +}, and Ar{sup 0}, respectively, delivered accurate total electron-emission yields, which are consistently higher for positively charged ions than for the corresponding isoenergetic neutral atoms. It was assured that potential emission could not be responsible for the observed differences. H{sup {minus}} bombardment at low impact energy causes equal yields as for H{sup 0}, but for higher kinetic energy even the yields for H{sup +} are surpassed. The results are explained with a semiempirical theory for heavy-particle-induced electron emission, assuming different screening of projectile cores by the accompanying electron(s) during the continuous change of projectile charge upon penetration of the solid. For H{sup +},H{sup 0} bombardment a quantitative description of the experimentally observed effects could be achieved by calculation of the stopping power for slow projectiles in different charge states, together with the electron-capture and -loss cross sections for these projectiles colliding with the target atoms.

• OSTI ID: 6509787
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:1; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARGON
COLLISIONS
ARGON IONS
GOLD
ATOM COLLISIONS
ION COLLISIONS
HELIUM
HELIUM IONS
HYDROGEN
HYDROGEN IONS 1 MINUS
HYDROGEN IONS 1 PLUS
NEON
NEON IONS
CROSS SECTIONS
ELECTRON CAPTURE
ELECTRON EMISSION
KEV RANGE 01-10
KEV RANGE 10-100
SURFACE IONIZATION
SURFACE PROPERTIES
WORK FUNCTIONS
ANIONS
CAPTURE
CATIONS
CHARGED PARTICLES
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
FUNCTIONS
GASES
HYDROGEN IONS
IONIZATION
IONS
KEV RANGE
METALS
NONMETALS
RARE GASES
TRANSITION ELEMENTS
656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)