Matrix effects in the neutralization of He ions at a metal surface containing oxygen
Charge exchange between He ions and a Ni (111) surface containing oxygen was studied
by Low-Energy Ion Scattering, using 1.25 keV He+ as primary ions. The energy resolved
yield of positive ions was detected after backscattering from Ni or O for different exposures of
Ni (111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to
the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and
the NiO phase at high dose. The presence of O in the surface makes resonant charge …
by Low-Energy Ion Scattering, using 1.25 keV He+ as primary ions. The energy resolved
yield of positive ions was detected after backscattering from Ni or O for different exposures of
Ni (111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to
the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and
the NiO phase at high dose. The presence of O in the surface makes resonant charge …
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