X-ray standing wave analysis of Sr / Si(001) surface phases
Abstract
Sub-monolayer surface phases of Sr on Si(0 0 1) have been studied with X-ray standing waves (XSW) and low-energy electron diffraction (LEED). XSW analysis of the (3x1), (2x1) and (2x3) phases indicates that the long-range ordered Sr forming the surface reconstruction is typically accompanied by a significant fraction of disordered Sr. Normal Si(0 0 4) and off-normal Si(0 2 2) and Si(1 1 1) XSW measurements made on the (2 x 3) phase indicate that the ordered Sr atoms must sit at either cave or bridge sites. The XSW results also suggest that when a sufficiently low substrate temperature is used during the formation of the (2x3) surface structure, this phase co-exists with short-range ordered regions of Sr atoms located at valley-bridge sites.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARD33003G