Reduction of the energy loss of swift molecular ions in solids due to vicinage effects in the charge state

Journal Article · Sat Sep 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.032902· OSTI ID:21020530

Heredia-Avalos, Santiago; Garcia-Molina, Rafael ^[1]

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1. Departamento de Fisica, CIOyN, Universidad de Murcia, Apartado 4021, E-30080 Murcia (Spain)

We have calculated the energy loss of swift O{sub 2}{sup +}, N{sub 2}{sup +}, and C{sub n}{sup +} (n=2-60) molecular ions moving through an amorphous carbon target. The dielectric formalism is used to evaluate the vicinage effects in the energy loss of the atomic ions that form the molecular projectile, but we take into account that the charge state of these atomic ions is affected by their correlated motion through the target and by the screened Coulomb potential between them. When vicinage effects in the charge state are taken into account, the Coulomb repulsion is weakened, leading to a reduction in the interatomic separations ({approx}3% for N{sub 2}{sup +} and {approx}9% for C{sub 60}{sup +}, both having similar velocities). These charge state effects can be neglected for diatomic molecular ions, but they give rise to a reduction of {approx}8% in the vicinage effects in the energy loss of larger molecular ions with cage like geometrical structures, like C{sub n}{sup +} (n=20,60) projectiles.

• OSTI ID: 21020530
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMORPHOUS STATE
ATOMIC IONS
CARBON
CATIONS
CHARGE STATES
COULOMB FIELD
DIELECTRIC MATERIALS
ENERGY LOSSES
MOLECULAR IONS
NITROGEN
NITROGEN 20
OXYGEN
REDUCTION
SOLIDS