STM observation of the 2 x 3 and c(2 x 6) structures on Ba/Si(100)

Citation
K. Ojima et al., STM observation of the 2 x 3 and c(2 x 6) structures on Ba/Si(100), SURF SCI, 491(1-2), 2001, pp. 169-174
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
0039-6028 → ACNP
Volume
491
Issue
1-2
Year of publication
2001
Pages
169 - 174
Database
ISI
SICI code
0039-6028(20010920)491:1-2<169:SOOT2X>2.0.ZU;2-U
Abstract
Barium induced 2 x 3 and c(2 x 6) structures on Si(l 0 0), which appear at the Ba coverage below 1/3 ML, have been studied by scanning tunneling micro scopy (STM). It is revealed that the 2 x 3 structure has only one adsorptio n phase, being independent of Ba coverage. Based on high resolution filled- state STM images where four protrusions are resolved in a unit cell, a mode l of 2 x 3 structure is proposed where the building unit consists of a Ba d imer and two Si dimers. It is also found that the c(2 x 6) structure always coexists with the 2 x 3 structure and has the same building block. The c(2 x 6) is realized when adjacent rows of building blocks are out of phase. ( C) 2001 Elsevier Science B.V. All rights reserved.