Abstract
The dipole polarizabilities, second-order hyperpolarizabilities, and optical absorption spectra of MSi 12 clusters (M = Sc–Zn) have been studied by using the (time-dependent) density functional theory. The results demonstrate that the correlation functional exerts more remarkable influence on the dipole polarizability and second-order hyperpolarizability calculations than the exchange term. Referring to MP2 results, B3LYP provides poorer dipole polarizabilities but more reliable second-order hyperpolarizabilities than B3PW91 and mPW1PW91 functionals. Additionally, the tunable (hyper)polarizabilities and optical absorption spectra have been evidently observed, which are attributed to the strong hybridization between 3d orbitals of M and 3s, 3p states of Si.
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