Binary-encounter electrons observed at 0 degree in collisions of 1--2-MeV/amu H sup + , C sup 6+ , N sup 7+ , O sup 8+ , and F sup 9+ ions with H sub 2 and He targets

Journal Article · Tue May 01 00:00:00 EDT 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.4816· OSTI ID:7097119

Lee, D H; Richard, P; Zouros, T J.M.; Sanders, J M; Shinpaugh, J L; Hidmi, H ^[1]

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1. J. R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506 (USA)

The energy distribution of binary-encounter electrons (BEE) produced in collisions of 1--2 MeV/amu H{sup +} and bare C, N, O, and F ions with H{sub 2} and He gas targets is reported at 0{degree} with respect to the beam direction. These electrons result from ionization of the target due to hard collisions with the projectile and can thus be considered to be produced in a process analogous to elastic scattering of a free electron from a highly charged ion. An impulse-approximation (IA) model has been developed to describe this process in which quasifree'' target electrons undergo 180{degree} Rutherford scattering in the projectile frame. The measured BEE double-differential production cross sections for bare ions were well described by this model and were found to scale with {ital Z}{sub {ital p}}{sup 2} and {ital E}{sub {ital p}}{sup {minus}({similar to}2.6--2.7)} where {ital Z}{sub {ital p}} and {ital E}{sub {ital p}} are the charge and energy of the projectile, respectively. An energy shift of the BEE below 4{ital t}, where {ital t} is the cusp electron energy, is observed and is also predicted by the IA treatment. A plane-wave Born approximation (PWBA) calculation for BEE production is also found to be in overall agreement with our data. However, the energy shift of the BEE peak could not be fully accounted for within this PWBA calculation.

• OSTI ID: 7097119
• Journal Information: Physical Review, A (General Physics); (USA), Vol. 41:9; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON IONS
ION-ATOM COLLISIONS
ION-MOLECULE COLLISIONS
FLUORINE IONS
HELIUM
HYDROGEN
HYDROGEN IONS 1 PLUS
NITROGEN IONS
OXYGEN IONS
BINARY ENCOUNTER METHOD
ELECTRON EMISSION
IONIZATION
MEV RANGE 01-10
MULTICHARGED IONS
SMALL ANGLE SCATTERING
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
GASES
HYDROGEN IONS
ION COLLISIONS
IONS
MEV RANGE
MOLECULE COLLISIONS
NONMETALS
RARE GASES
SCATTERING
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena