Electron emission during interactions of multicharged N and Ar ions with Au(110) and Cu(001) surfaces

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.7214· OSTI ID:5394518

Meyer, F W; Overbury, S H; Havener, C C; Zeijlmans van Emmichoven, P A ^[1]; Burgdoerfer, J ^[2]; Zehner, D M ^[3]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377 (United States)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377 (United States) Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6057 (United States)

We report measurements of energy distributions of electrons emitted during interactions 10{ital q}-keV N{sup 6+}, and Ar{sup {ital q}+} ({ital q}=7,8,9) ions with Au(110) and Cu(001) surfaces at grazing angles. The electron energy distributions have been measured as a function of angle of incidence, observation angle, and target-crystal azimuth. For both Au and Cu targets, the projectile {ital KLL} Auger peak observed for the case of the N{sup 6+} projectiles is seen to consist of two components whose intensities have strikingly different dependences on incident perpendicular velocity. The main component of the {ital KLL} peak is attributed to subsurface electron emission and is modeled using a Monte Carlo simulation of the projectile trajectories in the bulk. The second component, observed only for the smallest incident perpendicular velocities, is attributed to above-surface {ital KLL} Auger electron emission and is modeled using computer simulations of the resonance neutralization-autoionization cascade that occurs prior to projectile penetration of the surface. In the case of the Au target, {ital NNV} and {ital NVV} transitions, attributed to vacancy transfer from the projectile {ital K} shell to the {ital N} shell of Au, are also observed. The Monte Carlo simulation of the subsurface contribution to the electron emission is able to reproduce the observed angle-of-incidence dependence of both the projectile and the target Auger electron intensities. In addition, it shows reasonable agreement with the observed dependences of the projectile {ital KLL} intensity on observation angle and crystal azimuth.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5394518
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 44:11; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

665300* -- Interactions Between Beams & Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARGON IONS
AUGER EFFECT
CHARGED PARTICLES
COLLISIONS
COPPER
CRYSTAL FACES
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY SPECTRA
GOLD
ION COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
METALS
MULTICHARGED IONS
NITROGEN IONS
SECONDARY EMISSION
SPECTRA
SURFACES
TRANSITION ELEMENTS