Abstract
In this contribution, the presence of vicinage effects is demonstrated for H2+ ions slowing down in 20 nm thick aluminium target, using the 1.735 MeV resonance of 12C(p, p)12C elastic scattering. The stopping power ratio is deduced from the measured Elastic Backscattering Spectrometry (EBS) energy spectra of H+ and H2+ ions using the simulation code IBA DataFurnace. An enhancement of 30% is found in the energy loss of the H2+ ions as compared to the atomic ones. The influence of the Coulomb explosion on the energy loss straggling was also examined. This is evaluated for 100 nm thick target by adjusting the energy loss and the straggling parameters while processing the experimental data. A theoretical treatment, based on the Lindhard dielectric formalism generalized by N.R. Arista to molecular ions, was used to calculate the stopping power ratio for aluminium for comparison.
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