The adsorption geometry of Ag(111)-(√7 x √7)R19.1°-4Ar studied by LEED

被引：14

作者：

Caragiu, M ^{[1
]}

Leatherman, GS ^{[1
]}

Seyller, T ^{[1
]}

Diehl, RD ^{[1
]}

机构：

[1] Penn State Univ, Dept Phys, Davey Lab 104, University Pk, PA 16802 USA

来源：

SURFACE SCIENCE | 2001年 / 475卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

low energy electron diffraction (LEED); physical adsorption; surface structure; morphology; roughness; and topography;

D O I：

10.1016/S0039-6028(00)01061-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption geometry of Ag(1 1 1)-(root7 x root7)R19.1 degrees -4Ar was studied using low-energy electron diffraction (LEED). This higher-order commensurate phase was produced by preadsorbing a small amount of CO in order to block the close-packed steps, which pin the rotation angle of the overlayer. The dynamical LEED data were taken at a sample temperature of 31 K, and the results of the REED analysis indicate that one Ar atom per unit cell occupies the top of a Ag substrate atom, while the other three Ar atoms occupy bridge sites. There is little, if any, distortion of the Ar lattice from hexagonal symmetry. The average Ar-Bg perpendicular spacing in this structure is 3.22 +/- 0.07 Angstrom. The Ar-Ag nearest-neighbor distances are 3.22 and 3.52 Angstrom for top-site and bridge-site Ar atoms, respectively. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：89 / 95

页数：7

共 16 条

[1]

Barbieri A., Private Communication

[2]

BRUCH LW, 1997, PHYSICAL ADSORPTION

[3] THE USE OF A FLAT SUPPRESSOR IN LOW-ENERGY ELECTRON-DIFFRACTION [J].

DIEHL, RD ;

CHANDAVARKAR, S .

JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1989, 22 (08) :651-656

[4] Thermal and structural properties of N2 or CO on Ag(111) [J].

Leatherman, GS ;

Diehl, RD .

LANGMUIR, 1997, 13 (26) :7063-7067

[5] Phase diagrams and rotated incommensurate phases of K, Rb, and Cs adsorbed on Ag(III) [J].

Leatherman, GS ;

Diehl, RD .

PHYSICAL REVIEW B, 1996, 53 (08) :4939-4946

[6] Epitaxial rotation of two-dimensional rare-gas lattices on Ag(111) [J].

Leatherman, GS ;

Diehl, RD ;

Karimi, M ;

Vidali, G .

PHYSICAL REVIEW B, 1997, 56 (11) :6970-6974

[7] The geometry of xenon and krypton on Ru(001): a LEED IV investigation [J].

Narloch, B ;

Menzel, D .

SURFACE SCIENCE, 1998, 412-13 :562-579

[8] Adsorption and growth of Xe adlayers on the Cu(111) surface [J].

Park, JY ;

Kahng, SJ ;

Ham, UD ;

Kuk, Y ;

Miyake, K ;

Hata, K ;

Shigekawa, H .

PHYSICAL REVIEW B, 1999, 60 (24) :16934-16940

[9] RELIABILITY FACTORS FOR LEED CALCULATIONS [J].

PENDRY, JB .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1980, 13 (05) :937-944

[10] Observation of top-site adsorption for Xe on Cu(111) [J].

Seyller, T ;

Caragiu, M ;

Diehl, RD ;

Kaukasoina, P ;

Lindroos, M .

CHEMICAL PHYSICS LETTERS, 1998, 291 (5-6) :567-572

← 1 2 →