Projectile velocity and target temperature dependence of charge-state distributions of multicharged ions scattered during grazing interactions with a Au(110) surface
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)
- Kernfysisch Versneller Institute, Zernikelaan 25, NL 9747 AA Groningen (The Netherlands)
We have made systematic measurements of scattered projectile charge-state distributions for multicharged He, N, Ne, Na, and Ar ions grazingly incident on a Au(110) single-crystal target. For projectiles whose neutral binding energies lie below the valence band (N, Ar, He, and Ne), observed 1+ charge fractions were small at low velocities and steeply increased above well-defined threshold velocities. However, for Na projectiles with neutral binding energy above the Fermi level, a large (about 84{percent}) 1+ charge fraction was found. The velocity dependence of the Na neutral fraction shows a {open_quote}{open_quote}kinematic resonance{close_quote}{close_quote} due to the virtual population of electronic states above the Fermi level in the projectile rest frame. The measured sample temperature dependence of the scattered 1+ charge fraction for Ne{sup 9+} projectiles incident along the [110] surface channeling direction reveals a significant decrease in projectile neutralization once the (2{times}1)-(1{times}1) phase transition temperature of the Au(110) surface at 650 K has been reached. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 285944
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 1 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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