Abstract
Time-of-flight impact collision ion-scattering spectroscopy (TOF-ICISS) data obtained with 12 keV Ar + scattered from a GaAs(001) surface revealed the presence of millimonolayer amounts of oxygen. This magnitude of detection sensitivity is the result of an edge-effect rainbow singularity initiated by the forward scattering of argon by oxygen. Analysis of the TOF-ICISS data shows that the oxygen atoms are bonded primarily to surface gallium atoms. Published by Elsevier Science B.V.
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