METASTABLE (1X2) AND (1X3) RECONSTRUCTIONS OF PD(110)

By adsorption and subsequent reduction of oxygen on Pd(110), metastable (1 x 2) and (1 x 3) reconstructed surfaces have been produced. Oxygen was not present after the reduction but a small amount of residual hydrogen ( < 0.15 monolayers) remained. However this is not the origin of the reconstruction as adsorption of this amount of hydrogen on the clean surface did not cause reconstruction. The structures were stable up to approximately 370 K, and at higher temperatures they reverted to (1 x 1). These results are compared with Rh(110) where similar reconstructions have been found.