upward

CO molecule

Mitsui T, Rose M K, Fomin E, Ogletree D F, Salmeron M, Diffusion and pair interactions of CO molecules on Pd(111), PRL 94, 036101 (2005)

Mason S E, Grinberg I, Rappe A M, Adsorbate-adsorbate interactions and chemisorption at different coverage studied by accurate ab initio calculations: CO on transition metal surfaces, cond-mat/0512672