TY - JOUR
T1 - Adsorbate induced neutralization effects in low energy alkali and inert gas ion scattering
AU - Overbury, S. H.
AU - Dekoven, B. M.
AU - Stair, P. C.
N1 - Funding Information:
* Research sponsored by the Division of Chemical Sciences, US Department of Energy, under contract W-7405eng-26 with the Union Carbide Corporation. ** Northwestern University, Post-doctoral fellow. *** PCS and BMD acknowledge the support of the National Science Foundation, under grant CHE - 8206104.
PY - 1984/3
Y1 - 1984/3
N2 - The dissociative adsorption of oxygen on Mo(001) has been studied using low energy (500-1000 eV) Li+, K+ and He+ ion scattering. Oxygen adsorption affects the energy and angular distributions of scattered ions, and also the intensity of scattered ions changes in a manner which is dependent upon the type of ion used. The scattered ion intensities are examined as a function of oxygen exposure and compared for each type of ion for the same surface structure and under identical scattering geometry. The He+ intensity drops very sharply with increasing oxygen exposure, decreasing by a factor of 10 with ≤ 2 L exposure for all azimuthal angles of incidence. The Li+ intensity in all azimuths exhibits an initial decrease followed by a large increase and ultimately a decrease again as oxygen exposure increases. The K+ intensity, while decreasing with exposure for incidence in the [100] azimuth, is relatively unaffected by low oxygen exposure in the [110] azimuth. These contrasting dependencies are discussed and explained as manifestations of different neutralization mechanisms occuring in each case.
AB - The dissociative adsorption of oxygen on Mo(001) has been studied using low energy (500-1000 eV) Li+, K+ and He+ ion scattering. Oxygen adsorption affects the energy and angular distributions of scattered ions, and also the intensity of scattered ions changes in a manner which is dependent upon the type of ion used. The scattered ion intensities are examined as a function of oxygen exposure and compared for each type of ion for the same surface structure and under identical scattering geometry. The He+ intensity drops very sharply with increasing oxygen exposure, decreasing by a factor of 10 with ≤ 2 L exposure for all azimuthal angles of incidence. The Li+ intensity in all azimuths exhibits an initial decrease followed by a large increase and ultimately a decrease again as oxygen exposure increases. The K+ intensity, while decreasing with exposure for incidence in the [100] azimuth, is relatively unaffected by low oxygen exposure in the [110] azimuth. These contrasting dependencies are discussed and explained as manifestations of different neutralization mechanisms occuring in each case.
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U2 - 10.1016/0168-583X(84)90227-1
DO - 10.1016/0168-583X(84)90227-1
M3 - Article
AN - SCOPUS:11544319986
SN - 0168-583X
VL - 2
SP - 384
EP - 390
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-3
ER -