MULTICHANNEL NEUTRALIZATION AND REIONIZATION IN SCATTERING OF SLOW IONS

A simple kinetic model is proposed for the multichannel neutralization of slow ions scattered on a metal surface. The ''V'' shape peculiarit ies observed recently in scattering of Ar+, He+, N2+, CO+, CO2+ on Pt( 100) are interpreted as classic threshold anomalies arising from cross ing of the Fermi level by the ground electron levels of the particles. The model predicts two new types of peculiarities (''h'' and ''LAMBDA '' types) connected with the competition of multichannel neutralizatio n, reionization and deexcitation. The possibility of spectroscopy of t he surface collisional complexes (''spectroscopy of threshold anomalie s'') is also pointed out in this report.