Geometric structures and structural stabilities of germanium clusters Ge-7

Eight stable germanium clusters were acquired from Ge7 with molecular graphics and the optimizations and vibrational frequencies were carried out by B3LYP density function. When these isomers are designed, the germanium atoms could be in three -fold, four-fold or five-fold. By comparing the total energies of different isomers, the most stable model of Ge 7 is D5h. The structures with more high fold atoms are more stable.