AVS 51st International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP32
Inelastic Energy Losses and Ion Yields of Low Energy Ar@super +@ and Ne@super +@ from Transition Metals

Tuesday, November 16, 2004, 4:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: A. Kutana, California Institute of Technology
Authors: A. Kutana, California Institute of Technology
K.P. Giapis, California Institute of Technology
Correspondent: Click to Email
Inelastic losses and relative ion yields of 100-1300 eV Ar@super +@ and Ne@super +@ ions reflected off polycrystalline V, Nb, Ta, Zr, and Y surfaces were measured using a low energy scattering beamline apparatus. Use of a floating ICP source coupled to a small beam accelerator had overcome many problems pertinent to conventional sources in the sub-keV energy range and allowed measuring scattering energies with much greater precision. From the acquired energy spectra, peak positions of singly scattered ions were plotted versus the primary beam energy E@sub 0@ and compared with energies of totally elastic single collisions. For energies above 100 eV, the inelastic losses of singly scattered ions can be described by the power law E@sub 0@@super a@ with a<1. Scattering simulations based on the binary collision approximation with added local and nonlocal inelastic losses yielded the theoretical loss values that were related with the ones observed in experiment. For a given primary ion, the relative ion yields were generally found to vary insignificantly from one metal to another, except for the Ne@super +@-Y pair, where a much more efficient neutralization of Ne@super +@ was observed. Characteristic neutralization velocities were also estimated for the above projectile-target combinations.