THE CHARACTERIZATION OF THE TE(4X2) OVERLAYER ON A MO(110) SURFACE

被引：2

作者：

MAHAVADI, P ^{[1
]}

BAUER, E ^{[1
]}

GHRAYEB, R ^{[1
]}

HOU, M ^{[1
]}

机构：

[1] UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1990年 / 48卷 / 1-4期

关键词：

D O I：

10.1016/0168-583X(90)90128-H

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Quantitative low-energy ion scattering (LEIS) with alkali ions is used in combination with computer simulation in order to characterize the short-range order of a (4 × 2) tellurium overlayer on a molybdenum substrate. The simulations are performed in the binary-collision approximation with the computer code MARLOWE. The method requires the simultaneous determination of the model potential for the simulations and the overlayer structure. The Te(4 × 2)/Mo(110) superstructure allows two physically realistic configurations, assuming no second-layer reconstruction. In the first, the Te atoms sit in bridge positions and in the second, they sit in hollow sites. It is shown that the former can only be consistent with the simulation if the tellurium atoms are so close to the molybdenum surface that the Te-Mo distance should be close to 20% smaller than the sum of the metallic and covalent radii of molybdenum and tellurium. It is suggested that the hollow-site model is more reasonable and that the method allows a quite accurate determination of the interlayer spacing. © 1990.

引用

页码：311 / 314

页数：4

共 13 条

[1]

BAUER E, 1986, CHEM PHYSICS SOLID S, V6, P547

[2]

GHRAYEB R, 1987, PHYS REV B, V136, P7364

[3]

HOU M, 1976, NUCL INSTRUM METHODS, V132, P64

[4]

MAHAVADI P, 1989, THESIS CLAUSTHAL FRG