Effect of van der Waals interactions on H2 dissociation on clean and defected Ru(0001) surface Mikko Puisto, Heli Nenonen, Antti Puisto and Matti Alatalo Eur. Phys. J. B, 86 9 (2013) 396 Published online: 25 September 2013 DOI: 10.1140/epjb/e2013-40564-6