The Li-induced formation of the 3 x 1 reconstruction of the Si(111) surface was investigated by nuclear magnetic resonance on the Li nuclei. Two different electric field gradients were observed simultaneously and could be assigned to the electric field gradient of Li adsorbed on Si(111)-(7 x 7) and Li involved in the 3 x 1 reconstruction. The observed electric field gradients were positive, indicating a Li adsorption site not above but rather within the reconstruction. The implications of these findings on some of the proposed structural models of the 3 x 1 reconstruction were discussed.

Electric Field Gradients from NMR Measurements on the Si(111)3 x 1-Li Reconstruction. H.Kleine, D.Fick: New Journal of Physics, 2001, 3, 1