Silicon clusters Genetic algorithms 12 Global optimization 10 Silicon 8 Adsorption 4 Algorithms 4 Atomic physics 4 Binding Sites 4 Clustering algorithms 4 Crystal atomic structure 4 Density functional theory 4 Endohedral clusters 4 Energy calculation 4 Fukui function 4 Hydrogen 4 Models, Theoretical 4 Nanotechnology research 4 Parallel genetic algorithms 4 Probability density function 4 Relaxation effects 4 Relaxation processes 4 Structural optimization 4 adsorption 4 algorithm 4 article 4 binding site 4 chemistry 4 hydrogen 4 silicon 4 theoretical model 4