Experiments concerning electron capture and loss to the continuum and convoy electron production by highly ionized projectiles in the 0. 7--8. 5-MeV/u range traversing the rare gases, polycrystalline solids, and axial channels in gold

Journal Article · Tue Jun 01 00:00:00 EDT 1982 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.25.3015· OSTI ID:5122421

Breinig, M; Elston, S B; Huldt, S; Liljeby, L; Vane, C R; Berry, S D; Glass, G A; Schauer, M; Sellin, I A; Alton, G D; Datz, S; Overbury, S; Laubert, R; Suter, M

Velocity spectra of electrons emitted into the forward direction have been measured for 0.7--8.5-MeV/u projectile ions traversing He, Ne, and Ar targets, polycrystalline solids (C, Al, Ag, Au), and axial channels in gold. Spectral shapes and yields are compared and contrasted with one another and with theories which seek to account for the cusp-shaped peaks observed in terms of electron capture and loss to low-lying projectile-centered continuum states. We report the results of both singles and coincidence measurements, where the dependence of cusp shapes and yields on the emergent-ion charge state are examined. For electron capture to the continuum (ECC), variance is noted with respect to the simple, first-order theory of Dettmann, Harrison, and Lucas. The ECC yields are compared to experimental and theoretical studies of bound-state capture, especially to high Rydberg states. For electron loss to low-lying continuum states (ELC), variance is noted with respect to the corresponding theories of Briggs, Drepper, and Day, and ELC cross sections are compared to total electron-loss cross sections. For convoy electron production in solids, no known theory accounts for the results. As in ELC processes, convoy cusp widths are observed to be velocity independent. Convoy electron yields are also observed to be independent of emergent-ion charge state.

• Research Organization: University of Tennessee, Knoxville, Tennessee 37916
• OSTI ID: 5122421
• Journal Information: Phys. Rev. A; (United States), Vol. 25:6
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM
CHARGED-PARTICLE TRANSPORT
ARGON
ION-ATOM COLLISIONS
CARBON
GOLD
ION CHANNELING
HELIUM
ELECTRON CAPTURE
NEON
SILVER
ELECTRON EMISSION
ELECTRON LOSS
EXPERIMENTAL DATA
ION BEAMS
ION COLLISIONS
MEV RANGE 01-10
POLYCRYSTALS
ATOM COLLISIONS
BEAMS
CAPTURE
CHANNELING
COLLISIONS
CRYSTALS
DATA
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
GASES
INFORMATION
METALS
MEV RANGE
NONMETALS
NUMERICAL DATA
RADIATION TRANSPORT
RARE GASES
TRANSITION ELEMENTS
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments