Charge-state-dependent collisional energy-loss straggling of swift ions in a degenerate electron gas
- Department of Theoretical Physics, Institute of Physics, Technical University of Budapest, H-1521 Budapest (Hungary)
- Centro de Fisica de Materiales (CSIC-UPV/EHU)-MPC, P. Manuel de Lardizabal 3, 20018 San Sebastian (Spain)
In order to characterize the statistical aspect of the energy loss in particle penetration, Bohr developed a kinetic theory and applied it to a beam of fast alpha particles interacting with free electrons. The present study rests on this classical theory of collisional straggling, and it is implemented by using a partially screened Coulomb potential to model the electron-projectile interaction. The deflection angle of electron scattering in this long-ranged field is calculated analytically within the framework of classical mechanics. The transport fluctuation cross section, which is the basic quantity to the collisional straggling in Bohr's modeling, is determined numerically. By varying the number of bound electrons around the swift He ions, the effect of prefixed charge states in the collisional energy-loss straggling is quantified. An incoherent weighted summation of different fixed charge-state channels is discussed as well, by using normalized probabilities.
- OSTI ID:
- 21352463
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 80; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALPHA PARTICLES
ATOM COLLISIONS
CATIONS
CHARGE STATES
CHARGED PARTICLES
CLASSICAL MECHANICS
COLLISIONS
COULOMB FIELD
CROSS SECTIONS
ELECTRIC FIELDS
ELECTRON COLLISIONS
ELECTRON GAS
ELECTRON-ATOM COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY
ENERGY LOSSES
FERMIONS
FLUCTUATIONS
HELIUM IONS
IONIZING RADIATIONS
IONS
LEPTONS
LOSSES
MECHANICS
POTENTIAL ENERGY
PROBABILITY
RADIATIONS
STRAGGLING
VARIATIONS