X ray standing wave measurements were undertaken to study the bonding position of Sb adatoms on the Sb-saturated Si(001)-(2×1) surface. Using the (004) and (022) Bragg reflections, we find that the Sb atoms form dimers, and that the center of the Sb ad-dimers lies 1.64 angstrom above the bulk-like Si(004) surface atomic plane. This work describes the extraction of structural parameters for a dimerized surface from in-plane measurements. Our results are compared to two structural models consisting of dimers whose bonds are parallel to the surface plane and whose centers are either shifted or unshifted (parallel to the dimer bond direction) relative to the underlying substrate planes. We thus find two special cases consistent with our data: one with symmetric (unshifted) dimers having a dimer bond length of 2.81 angstrom, and the other with midpoint-shifted dimers, having a bond length of 2.88 angstrom and a lateral shift of 0.21 angstrom.
|Original language||English (US)|
|Number of pages||6|
|Journal||Materials Research Society Symposium - Proceedings|
|State||Published - Jan 1 1995|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials