Abstract
Correlated thermal desorption (TDS) and work function (Δφ) measurements are reported for desorption of oxygen from a Pd(110) surface. The TD spectra reveal three major peaks, one (α) being at low temperature and the other two (β 1 and β 2) at high temperature. Isotope exchange experiments prove that the a state and two β states originate from molecular and atomic adsorbates respectively. Oxygen in the β 1 state produces a negative work function change of approximately ∼ 250 ± 10 mV. The β 1 state is believed to be associated with subsurface oxygen. Neither of the β-states appears to saturate even after long exposure at 475 K. This is particularly striking for the β 1 state and may provide further evidence for subsurface oxygen or oxide formation.
Published Version
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