Scattering of multiply charged ions from surfaces

We have measured surface channeling and resonant coherent excitation of N6 ions scattered off a Pt(110)(1 x 2) surface at energies of 23.0 MeV and 21 .8 MeV. In order to achieve surface channeling at those energies small graz ing angles of incidence below 0.10 degrees must be achieved. When scattered at 21.8 MeV along the [110] surface semichannels resonant coherent excitat ion (RCE) is observed. The effect is studied as a function of the azimuthal angle and the angle of incidence. The experimental findings agree with ear lier bulk channeling experiments. In comparison with theoretical prediction s satisfactory agreement is found. (C) 1999 Elsevier Science B.V.