Small clusters, which mimic Si(111) surface with dangling bond defect. Molecular and axes are oriented along the  and  directions in the crystal.
Wavelength dependence of first hyperpolarizability along dangling bond in clusters.
Wavelength dependence of first hyperpolarizability components and in silyl radical.
Second harmonic generation profiles obtained from dynamic hyperpolarizabilities of clusters along with the experimental profile measured by Ito and Hirayama (Ref. 25).
Static polarizability (in a.u.) and first hyperpolarizability (in a.u.) of silyl radical. by symmetry requirements. and by symmetry requirements.
Static hyperpolarizabilities of clusters. and by symmetry requirements. SOS-SCI results from Ref. 26.
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