RECONSTRUCTED (881) SI SURFACE-STRUCTURE OBSERVED BY SCANNING-TUNNELING-MICROSCOPY

The high-index (881) surface has been studied by ultra-high-vacuum sca nning tunneling microscopy (STM). Reconstruction of the (881) Si surfa ce was found to occur, as evident from the appearance of a number of d ifferent characteristic patterns in the STM image, including various k inds of terraces, step walls, and kinks. A typical terrace had, on ave rage, a (7 x 2) reconstruction. The step walls consisted of several sp lit lattices. Their multiple reciprocal networks and their relationshi p to the step walls has been analyzed. The kinks were found to consist of one-dimensional long-period superlattices. The reason for the diso rder is discussed in terms of the relationship between the effective d angling-bond density and the periodic bond chain vector approximation. (C) 1997 American Institute of Physics.