Determination of the bonding configuration of the metastable molecular oxygen adsorbed on a Si(111)-(7×7) surface

Abstract

The initial adsorption stage of oxygen on a (formula presented) surface has been investigated using real time high-resolution core-level measurements at 100 K. Among the six (formula presented) components observed on an (formula presented) exposed Si(111) surface, the three components, whose intensities saturate at the same dosage, have the same lifetime. These results lead to a conclusion that three oxygen atoms with different chemical environments compose the metastable species. Based on a comparison with our calculated (formula presented) binding energies, we have determined the bonding configuration of the metastable oxygen. © 2002 The American Physical Society.