Direct measurement of molecular breakup dynamics and vicinage effect of swift proton clusters using narrow nuclear resonance profiling

A. L'Hoir (1) , J. J. Ganem , I. Trimaille (1) , I. C. Vickridge

1 INSP - Institut des Nanosciences de Paris

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 (18)O atoms High depth resolution is achieved by using the (18)O (p,alpha)(15)N 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) approximate to (2/pi)R(ad) where R(ad) = V/omega(p) is an adiabatic cut-off for a valence electron gas with plasmon frequency omega p approximate to 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 gamma approximate to 22 eV and including multiple scattering on target nuclei (C) 2010 Elsevier B.V. All rights reserved.

Mots clés: Energy loss; Coulomb explosion; Vicinage effect

Domaines: Matière Condensée [cond-mat]

A. L'Hoir, J. J. Ganem, I. Trimaille, I. C. Vickridge. Direct measurement of molecular breakup dynamics and vicinage effect of swift proton clusters using narrow nuclear resonance profiling. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2010, 268 (17-18), pp.2850-2853. ⟨10.1016/j.nimb.2010.06.044⟩. ⟨hal-01237370⟩