Vicinage forces between molecular and atomic fragments dissociated from small hydrogen clusters and their effects on energy distributions

Journal Article · Mon Dec 01 04:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.062902· OSTI ID:20640493

Barriga-Carrasco, Manuel D; Garcia-Molina, Rafael ^[1]

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

In this paper we analyze the dynamic evolution of molecular and atomic fragments of small hydrogen clusters interacting with thin solid foils. We compare the vicinage forces, calculated within the dielectric formalism, for H{sup +}, H{sup 0}, and H{sub 2}{sup +} fragments. Using a molecular dynamics numerical code we determine the energy distribution of the fragments after interacting with the target. This distribution is compared to experimental results for protons coming from the fragmentation of v=2.02 a.u. H{sub 2}{sup +} ions impinging on an aluminum foil; a fraction of neutral H{sup 0} is needed to be included in the simulation to get a good agreement with the experimental results. The H{sub 2}{sup +} energy spectra for v=5.42 a.u. H{sub 3}{sup +} interacting with amorphous carbon is also determined. The asymmetry in the Coulomb peaks appearing in the energy spectra both experimentally and in our calculation is opposite for H{sub 2}{sup +} than in H{sup +}; kinematic effects and differences in the electronic stopping are enough to reproduce the difference in the alignment of H{sub 2}{sup +} and H{sup +} fragments.

• OSTI ID: 20640493
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ALUMINIUM
ASYMMETRY
ATOMS
CARBON
COMPARATIVE EVALUATIONS
DIELECTRIC MATERIALS
DISTRIBUTION
ENERGY LOSSES
ENERGY SPECTRA
EVOLUTION
FOILS
HYDROGEN IONS 1 PLUS
HYDROGEN IONS 2 PLUS
HYDROGEN IONS 3 PLUS
MOLECULAR CLUSTERS
MOLECULAR DYNAMICS METHOD
MOLECULES
PROTONS
SIMULATION
SURFACES