Convoy electron production in heavy-ion-solid collisions

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5233509

Sellin, I A; Breinig, M; Brandt, W; Laubert, R

The properties of the sharp v vector/sub e/ approx. = v vector cusps observed in the velocity spectrum of convoy electrons (v vector/sub e/) ejected in heavy ion-solid collisions in the ion velocity range (v vector) 6 to 18 au are compared to the properties of analogous cusps observed in binary electron capture to the continuum (ECC) and electron loss to the continuum (ELC) collisions in gases. Apart from a skew toward v vector/sub e/ > v vector, the v-independent convoy distributions observed are very similar to those for ELC and the cusp widths are the same in both cases. While the shape of convoy peaks is approximately independent of projectile Z, v, and of target material, yields in polycrystalline targets (C, Al, Ag, Au) exhibit a strong dependence on Z and v. Coincidence experiments in which convoy electrons are allocated according to emergent ion charge-state q/sub e/ show a surprising independence of q/sub e/, mirroring the unweighted statistical emergent charge-state fraction. Coincidence experiments of O/sup 6 +/ /sup 7 +/ /sup 8 +/ ions traversing < 110 > and < 100 > channels in Au show a strong yield suppression and a dependence of yield on the channel chosen. Interpretation of these observations, comparisons to convoy production studies using protons, and a discussion of remaining puzzles is given. The history of ECC, ELC, and wake-riding models of convoy electron production is also reviewed.

• Research Organization: Oak Ridge National Lab., TN (USA); New York Univ., NY (USA); East Carolina Univ., Greenville, NC (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5233509
• Report Number(s): CONF-810728-6; ON: DE82018174
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular &amp; Chemical Physics-- Beams &amp; their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM
CAPTURE
CARBON
CATIONS
CHARGED PARTICLES
COLLISIONS
ELECTRON CAPTURE
ELECTRON EMISSION
ELECTRON LOSS
ELECTRON SPECTRA
ELEMENTS
EMISSION
ENERGY RANGE
GOLD
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
IONS
METALS
MEV RANGE
MEV RANGE 01-10
NONMETALS
OXYGEN IONS
SPECTRA
TRANSITION ELEMENTS