Molecular dynamics calculations were performed to calculate the formation energy for He in Ni-vacancy and Pd-vacancy clusters. The binding energies of He and metal self-interstitial atoms to the He-vacancy cluster were also determined. The comparison of these energies indicated that He to vacancy ratio (He/V) for He in Pd was much higher.

The Formation Energies and Binding Energies of Helium Vacancy Cluster - Comparative Study in Ni and Pd. J.Yang, B.Ao, W.Hu, X.Wang: Journal of Physics - Conference Series, 2006, 29, 190-3