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Title: Charge exchange at molecular-orbital pseudocrossings as an important mechanism for nonkinetic-electron emission in slow-multicharged-ion (v

Abstract

Kinetic energy distributions of electrons emitted in the interaction of slow (10q-keV) multicharged ions (N,O,Ne,Ar) with metal surfaces (Cu,Au) are presented. We observe secondary-electron emission, quasielastic-scattering processes, and, superimposed upon this, one-center Auger decay of both projectile and target vacancies. Two classes of target Auger-decay features are observed. Long-lived target vacancies decay, leading to discrete Auger line features, similar to those arising from electron-impact excitation. Short-lived target vacancies appear to decay in the field of the projectile, leading to broadened Auger line features. Observation of the decay of target vacancies, and their correlation with the presence of particular projectile vacancies, shows that a measurable fraction of projectile vacancies survive until small-impact-parameter collisions with surface or subsurface atoms. The data imply that projectile neutralization proceeds via two channels, viz., capture of valence-band electrons to projectile excited states, followed by one-center Auger decay, and at pseudocrossings of molecular orbitals correlating with discrete inner-shell levels of the target and projectile.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
OSTI Identifier:
6950708
Resource Type:
Journal Article
Journal Name:
Phys. Rev. A; (United States)
Additional Journal Information:
Journal Volume: 38:5
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; GOLD; AUGER EFFECT; ENERGY SPECTRA; ION COLLISIONS; SECONDARY EMISSION; RARE GASES; ANGULAR DISTRIBUTION; BEAM NEUTRALIZATION; COPPER; MONOCRYSTALS; MULTICHARGED IONS; NITROGEN; OXYGEN; SURFACES; CHARGED PARTICLES; COLLISIONS; CRYSTALS; DISTRIBUTION; ELEMENTS; EMISSION; FLUIDS; GASES; IONS; METALS; NONMETALS; SPECTRA; TRANSITION ELEMENTS; 656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)

Citation Formats

Snowdon, K J, Havener, C C, Meyer, F W, Overbury, S H, Zehner, D M, and Heiland, W. Charge exchange at molecular-orbital pseudocrossings as an important mechanism for nonkinetic-electron emission in slow-multicharged-ion (v. United States: N. p., 1988. Web. doi:10.1103/PhysRevA.38.2294.
Snowdon, K J, Havener, C C, Meyer, F W, Overbury, S H, Zehner, D M, & Heiland, W. Charge exchange at molecular-orbital pseudocrossings as an important mechanism for nonkinetic-electron emission in slow-multicharged-ion (v. United States. https://doi.org/10.1103/PhysRevA.38.2294
Snowdon, K J, Havener, C C, Meyer, F W, Overbury, S H, Zehner, D M, and Heiland, W. 1988. "Charge exchange at molecular-orbital pseudocrossings as an important mechanism for nonkinetic-electron emission in slow-multicharged-ion (v". United States. https://doi.org/10.1103/PhysRevA.38.2294.
@article{osti_6950708,
title = {Charge exchange at molecular-orbital pseudocrossings as an important mechanism for nonkinetic-electron emission in slow-multicharged-ion (v},
author = {Snowdon, K J and Havener, C C and Meyer, F W and Overbury, S H and Zehner, D M and Heiland, W},
abstractNote = {Kinetic energy distributions of electrons emitted in the interaction of slow (10q-keV) multicharged ions (N,O,Ne,Ar) with metal surfaces (Cu,Au) are presented. We observe secondary-electron emission, quasielastic-scattering processes, and, superimposed upon this, one-center Auger decay of both projectile and target vacancies. Two classes of target Auger-decay features are observed. Long-lived target vacancies decay, leading to discrete Auger line features, similar to those arising from electron-impact excitation. Short-lived target vacancies appear to decay in the field of the projectile, leading to broadened Auger line features. Observation of the decay of target vacancies, and their correlation with the presence of particular projectile vacancies, shows that a measurable fraction of projectile vacancies survive until small-impact-parameter collisions with surface or subsurface atoms. The data imply that projectile neutralization proceeds via two channels, viz., capture of valence-band electrons to projectile excited states, followed by one-center Auger decay, and at pseudocrossings of molecular orbitals correlating with discrete inner-shell levels of the target and projectile.},
doi = {10.1103/PhysRevA.38.2294},
url = {https://www.osti.gov/biblio/6950708}, journal = {Phys. Rev. A; (United States)},
number = ,
volume = 38:5,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 1988},
month = {Thu Sep 01 00:00:00 EDT 1988}
}