Charge state distributions from highly charged ions channeled at a metal surface
- Oak Ridge National Lab., TN (United States)
The vast majority of the experimental work in the field of multicharged ion-surface interactions, to date, has focused on x-ray and particularly on electron emission. These experiments include measurements of the total electron yield, the emission statistics of the electrons, and, most of all, the electron energy distributions. So far, little attention has been paid to the fate of the multicharged projectile ions after the scattering. To our knowledge, the only measurement of the charge state distribution of the scattered ions is the pioneering experiment of de Zwart et al., who measured the total yield of scattered 1+, 2+, and 3+ ions as a function of the primary charge state q (q = 1--11) for 20 key Ne, Ar, and Kr ions after reflection from a polycrystalline tungsten target. Their main finding is the sudden onset of scattered 3+ ions when inner-shell vacancies are present in the primary particles. This suggests that a certain fraction of the inner-shell vacancies survives the entire collision event, and decays via autoionization on the outgoing path. Since the projectiles scattered in the neutral charge state could not be detected in the experiment of de Zwart et al., they were not able to provide absolute charge state fractions. In our present experiment, we focus on the scattered projectiles, measuring both the final charge state and the total scattering angle with a single 2D position sensitive detector (PSD). This method gives us the number of positive, as well as neutral and negative, scattered ions, thus allowing us to extract absolute charge state fractions. Using a well-prepared single Au(110) crystal and a grazing incidence geometry, we were able to observe surface channeling along the [001] channels.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Deutsche Forschungsgemeinschaft, Bonn (Germany)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10155344
- Report Number(s):
- CONF-9403123-2; ON: DE94012755
- Resource Relation:
- Conference: 15. Werner Brandt workshop on penetration phenomena,Gainesville, FL (United States),10-11 Mar 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
ION COLLISIONS
CHARGE DISTRIBUTION
GOLD
CHARGE STATES
MULTICHARGED IONS
POSITION SENSITIVE DETECTORS
SCATTERING
ION CHANNELING
OXYGEN IONS
665300
664300
INTERACTIONS BETWEEN BEAMS AND CONDENSED MATTER
COLLISION PHENOMENA