STRUCTURAL-PROPERTIES OF ORDERED ALKALI-METAL OVERLAYERS - A LEED ANALYSIS OF THE RU(0001)-(ROOT-3X-ROOT-5) R30-DEGREES-LI PHASE IN COMPARISON

被引：13

作者：

GIERER, M ^{[1
]}

OVER, H ^{[1
]}

BLUDAU, H ^{[1
]}

ERTL, G ^{[1
]}

机构：

[1] MAX PLANCK GESELL,FRITZ HABER INST,D-14195 BERLIN,GERMANY

来源：

SURFACE SCIENCE | 1995年 / 337卷 / 03期

关键词：

ALKALI METALS; LOW-ENERGY ELECTRON DIFFRACTION (LEED); RUTHENIUM; SURFACE STRUCTURE;

D O I：

10.1016/0039-6028(95)00617-6

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 geometry of the (root 3 X root 3)R30 degrees Li/Ru(0001) phase at a coverage of 0.33 was investigated using low-energy electron diffraction. The analysis revealed that Li atoms reside in the threefold hcp sites as also found with the other alkali metal (root 3 X root 3)R30 degrees phases on Ru(0001). The effective radius of Li turned out to be 1.39 Angstrom close to the covalent Pauling radius. The adsorption of lithium induces a small rumpling of the second Ru layer which has not been observed for the other alkali metal/Ru(0001)-(root 3 X root 3)R30 degrees surfaces. Structural results of the alkali metal/Ru(0001) systems are compared with those of other surfaces. It turns out that at low adsorption temperatures? the occupation of on-top sites is favored for adsorption of bigger alkali metal atoms on close-packed surfaces of ''soft'' metals undergoing local reconstruction.

引用

页码：198 / 204

页数：7

共 35 条

[1] TOP-SITE ADSORPTION FOR K ON CU(111) AND NI(111) SURFACES [J].

ADLER, DL ;

COLLINS, IR ;

LIANG, X ;

MURRAY, SJ ;

LEATHERMAN, GS ;

TSUEI, KD ;

CHABAN, EE ;

CHANDAVARKAR, S ;

MCGRATH, R ;

DIEHL, RD ;

CITRIN, PH .

PHYSICAL REVIEW B, 1993, 48 (23) :17445-17451

[2] TEMPERATURE-DEPENDENT LOCAL GEOMETRIES IN THE SYSTEM AL(100)-C(2X2)-NA - A SURFACE EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDY [J].

AMINPIROOZ, S ;

SCHMALZ, A ;

BECKER, L ;

PANGHER, N ;

HAASE, J ;

NIELSEN, MM ;

BATCHELOR, DR ;

BOGH, E ;

ADAMS, DL .

PHYSICAL REVIEW B, 1992, 46 (23) :15594-15597

[3] THE SURFACE-STRUCTURE OF A C(2 X-2) POTASSIUM OVERLAYER ON CO(1010) [J].

BARNES, CJ ;

HU, P ;

LINDROOS, M ;

KING, DA .

SURFACE SCIENCE, 1991, 251 :561-567

[4]

DEMUTH JE, 1974, J PHYS C SOLID STATE, V8, pL25

[5]

DOERING DL, 1986, SURF SCI, V175, pL730, DOI 10.1016/0039-6028(86)90224-4

[6] TOP-SITE ADSORPTION FOR POTASSIUM ON NI(111) [J].

FISHER, D ;

CHANDAVARKAR, S ;

COLLINS, IR ;

DIEHL, RD ;

KAUKASOINA, P ;

LINDROOS, M .

PHYSICAL REVIEW LETTERS, 1992, 68 (18) :2786-2789

[7]

GIERER M, 1992, SURF SCI, V279, pL170, DOI 10.1016/0039-6028(92)90731-K

[8]

GIERER M, UNPUB

[9] FAST LEED-INTENSITY MEASUREMENTS WITH A COMPUTER-CONTROLLED TELEVISION SYSTEM [J].

HEILMANN, P ;

LANG, E ;

HEINZ, K ;

MULLER, K .

APPLIED PHYSICS, 1976, 9 (03) :247-251

[10] STRUCTURAL-ANALYSIS OF SURFACES BY LEED [J].

HEINZ, K .

PROGRESS IN SURFACE SCIENCE, 1988, 27 (04) :239-326

← 1 2 3 4 →