Pentameric PdAu and PdPt nanoparticles on the MgO(1 0 0) surface and their CO and O2 adsorption properties Mikail Aslan and Roy L. Johnston Eur. Phys. J. B, 91 7 (2018) 138 Published online: 02 July 2018 DOI: 10.1140/epjb/e2018-90060-6