Abstract
We report on the first direct observation of the evolution with time of the vicinage effect and Coulomb explosion for H 2 + and H 3 + molecules in a thick amorphous silica layer enriched with 18O atoms. High depth resolution is achieved by using the 18O ( p, α) 15N nuclear reaction narrow resonance around E R = 151 keV/nucleon (corresponding to a velocity V), and scanning the beam energy around E R . The results are well described when using a Coulomb screening radius r s ≈ (2/ π) R ad where R ad = V/ ω p is an adiabatic cut-off for a valence electron gas with plasmon frequency ω p ≈ 24 eV. The vicinage effect is reproduced when describing the experimental energy loss function of the target valence electron gas by a single Drude function with damping factor γ ≈ 22 eV and including multiple scattering on target nuclei.
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