Dissociation of MeV H2+ and HeH+ ions at glancing-angle incidence on a clean crystal surface

Dissociative scattering of fastHeH+ions at glancing-angle incidence on a crystal surface

“…3. An example of the energy spectra of H+ scattered at the angle of specular reflection, where the energy of incident HeH+ is 0.8 MeV and the angle of incidence is 6.4 mrad.…”

“…We have previously reported results for the angular and energy distributions of the fragments for glancingangle incidence of MeV H2+ and HeH+ ions on a clean (001) surface of SnTe [3,4]. The geometry of the scattering is not symmetric around the beam axis, which is different from that with foil-induced fragmentation.…”

Interaction of fast charges with a rough metal surface

“…The case of two ions at finite separation that have equal charges Ze is of interest, e.g., for studying the co-moving ion fragments during Coulomb explosion of a homonuclear diatomic molecule on a surface [15,16,19,20]. Both experiments and simulations of grazing scattering of such molecules from surfaces showed that their inter-nuclear axis tends to remain parallel to the surface during Coulomb explosion [14][15][16][17][18][19][20][21]24]. It is then worthwhile studying the configuration of two point ions at equal and fixed distances z 0 from the z = 0 plane with their relative position vector d = R 2 − R 1 being parallel to that plane, giving a simple structure factor of the form…”

“…In this case one may perform a 2D averaging over the orientation angles of d, which amounts to replacing the factor cos(Q ⋅ d) in Eqs. (17) and (18) …”

“…Such processes may include dissociation of the incident molecule [17,18], Coulomb explosion of its ionic fragments [19,20], vicinage effect in the energy loss of these fragments [21], and secondary electron emission from the surface [16]. Therefore, it is interesting to explore, e.g., the effects of roughness of nano-structured metal surfaces [11] on the dynamics of Coulomb explosion, as well as on the vicinage effects in the energy loss of a pair of spatially correlated ions moving parallel to the surface.…”