Compression for data archiving and backup revisited
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
The geometric structure of the Si(111)-(3 × 3) R30 Ag surface has previously been studied by numerous surface-science techniques. Despite the abundance of data, no model for the surface has emerged as a clear favorite. Commonly proposed models feature honeycomb structures of either Ag or Si, with two or three Ag atoms per 3 × 3 unit cell. Results from medium-energy ion scattering conclusively show that each unit cell contains three Ag atoms. In addition, the surface is highly reconstructed, with atomic reordering of the Si atoms of similar magnitude to the clean (7×7) surface. Conventional models of the surface do not incorporate sufficient displacements of silicon atoms. Two new models are compatible with our results. One is a model constructed from silicon adatoms and vacancies. The other is a model based on x-ray scattering results, consisting of a subsurface silver honeycomb-chained trimer. © 1989 The American Physical Society.
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009
A. Gupta, R. Gross, et al.
SPIE Advances in Semiconductors and Superconductors 1990
Ming L. Yu
Physical Review B
S. Cohen, J.C. Liu, et al.
MRS Spring Meeting 1999