Abstract
The open trough and row Mo(1 1 2) surface serves as substrate for the epitaxial growth of MoO 2. XPS, UPS and STM studies of the oxygen adsorption allow to monitor step-by-step the transformation of the electronic and morphological properties during this process. XPS and UPS spectra reveal that a stable oxygen chemisorbed state precedes the formation of MoO 2. STM topographs identify this oxygen chemisorbed phase as an oxygen-induced p(2 × 3) reconstruction of the missing row type. This precursor state evolves into a flat p(1 × 3) reconstructed (0 1 0) MoO 2 layer which roughens by the formation of (1 1 0) facets under further oxygen exposure.
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