Electron emission during multicharged ion-surface interactions

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6477653

Zeijlmans van Emmichoven, P A ^[1]; Havener, C C; Meyer, F W; Zehner, D M ^[2]

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1. Oak Ridge National Lab., TN (USA) Joint Inst. for Heavy Ion Research, Oak Ridge, TN (USA)
2. Oak Ridge National Lab., TN (USA)

Recent measurements of electron spectra for slow multicharged N ion-surface collisions are presented. The emphasis is on potential emission, i.e. the electron emission related to the neutralization of the ions. When using N ions that carry a K shell vacancy into the collision, characteristic K Auger electron emission from the projectiles is observed, as well as, for specific surfaces, target atom Auger transitions (resulting from vacancy transfer). Measurements of the intensity of these Auger transitions as a function of the time the ions spend above the surface can serve as a useful probe of the timescales characterizing the relevant neutralization processes. This technique is elucidated with the help of some computer simulations. It is shown that neutralization timescales required in the atomic ladder picture, in which neutralization takes place by resonant capture followed by purely intra-atomic Auger transitions, are too long to explain our experimental results. The introduction of additional neutralization/de-excitation mechanisms in the simulations leads to much better agreement with the experiments.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER; JIHIR
• DOE Contract Number: AC05-84OR21400; FG05-87ER40361
• OSTI ID: 6477653
• Report Number(s): CONF-901116-6; ON: DE91000615
• Country of Publication: United States
• Language: English

Related Subjects

640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AUGER EFFECT
CHARGED PARTICLES
COLLISIONS
COMPUTERIZED SIMULATION
COPPER
ELECTRON EMISSION
ELECTRON SPECTRA
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
GOLD
ION COLLISIONS
IONS
K SHELL
METALS
MULTICHARGED IONS
NITROGEN IONS
SIMULATION
SPECTRA
SURFACES
TRANSITION ELEMENTS