Scattering of multiply charged ions from surfaces

We have measured surface channeling and resonant coherent excitation of N(6+) 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 grazing angles of incidence below 0.10 degrees must be achieved. When scattered at 21.8 MeV along the [110] surface semichannels resonant coherent excitation (RCE) is observed. The effect is studied as a function of the azimuthal angle and the angle of incidence. The experimental findings agree with earlier bulk channeling experiments. In comparison with theoretical predictions satisfactory agreement is found. (C) 1999 Elsevier Science B.V.