Abstract
The size-dependent potential parameters method is used to investigate the effect of many-body interactions on the structural stabilities and the cohesive energy of molybdenum (Mo) and tungsten (W) spherical metallic nanoparticles. The total interaction energy is represented in terms of a two-body Mie-type potential plus a three-body Axilord-Teller-type potential. Results emphasized the importance of multi-body forces to explain nano-structures. The predicted cohesive energy for these nanoparticles is observed to decrease with decreasing sizes, a result which is in agreement with experimental results.