Gaussian-2 (G2) theory for third-row non-transition elements is used t
o calculate energies of germanium clusters, Ge-n (n = 2-5). The G2 ene
rgies are used to derive accurate binding energies for the clusters. T
he results for Ge-2 and Ge-3 are in agreement with experiment while th
ere is some disagreement for Ge-4 and Ge-5. The binding energies are a
lso calculated using the B3LYP density functional method with the 6-31
1 + G(3df,2p) basis set and compared with the G2 results and experimen
t.