SYMMETRY AND STRUCTURE OF THE RECONSTRUCTED NI(110)-(2X1)O SURFACE

被引:46
作者
VOIGTLANDER, B
LEHWALD, S
IBACH, H
机构
[1] Institut für Grenzflächenforschung und Vakuumphysik, Kernforschungsanlage Jülich, Postfach 1913
关键词
D O I
10.1016/0039-6028(90)90434-A
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
We have measured the dispersion of oxygen and nickel vibrational modes of the reconstructed Ni(110)-(2 × 1)O surface along the high symmetry directions using momentum-resolved electron energy loss spectroscopy (EELS). Observation of the frequency shifts upon substitution of O16 by O18 discriminates adsorbate from substrate phonons. With the scattering plane along [110] two oxygen modes are observed, which are also dipole active. Their frequency at the \ ̄gG point (at 120 K) is 239 and 382 cm-1 respectively. With the scattering plane aligned along [001] an additional third oxygen mode at about 800 cm-1 is observed off-specular only. According to EELS selection rules the symmetry of the surface is thus Cs with the mirror plane oriented along [110]. This is in agreement with the "saw-tooth" reconstruction model proposed for this surface, however also with a "modified missing-row" model with the oxygen atoms moved out of the long-bridge site along either the [110] or the [110] direction. © 1990.
引用
收藏
页码:162 / 170
页数:9
相关论文
共 17 条
  • [1] LOCAL BONDING GEOMETRY OF O(2X1) ON NI(110) - A SURFACE EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDY
    BABERSCHKE, K
    DOBLER, U
    WENZEL, L
    ARVANITIS, D
    BARATOFF, A
    RIEDER, KH
    [J]. PHYSICAL REVIEW B, 1986, 33 (08): : 5910 - 5913
  • [2] REAL-SPACE OBSERVATION OF THE 2X1 STRUCTURE OF CHEMISORBED OXYGEN ON NI(110) BY SCANNING TUNNELING MICROSCOPY
    BARO, AM
    BINNIG, G
    ROHRER, H
    GERBER, C
    STOLL, E
    BARATOFF, A
    SALVAN, F
    [J]. PHYSICAL REVIEW LETTERS, 1984, 52 (15) : 1304 - 1307
  • [3] ADSORPTION SITE OF OXYGEN-CHEMISORPTION ON NI(110) AT ROOM-TEMPERATURE - AN EELS STUDY
    BARO, AM
    OLLE, L
    [J]. SURFACE SCIENCE, 1983, 126 (1-3) : 170 - 176
  • [4] KINETICS AND MECHANISM OF THE OXYGEN INDUCED SURFACE RECONSTRUCTION ON NI(110)
    BEHM, RJ
    ERTL, G
    PENKA, V
    SCHWANKNER, R
    [J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1985, 3 (03): : 1595 - 1596
  • [5] BRUNDLE CR, 1985, CHEM PHYSICS SOLID S
  • [6] A HELIUM DIFFRACTION STUDY OF O-2 CHEMISORPTION ON NI(110)
    ENGEL, T
    RIEDER, KH
    BATRA, IP
    [J]. SURFACE SCIENCE, 1984, 148 (2-3) : 321 - 337
  • [7] COADSORPTION OF OXYGEN AND WATER AT NI(110) SURFACES
    HOCK, M
    SEIP, U
    BASSIGNANA, I
    WAGEMANN, K
    KUPPERS, J
    [J]. SURFACE SCIENCE, 1986, 177 (02) : L978 - L982
  • [8] IBACH H, IN PRESS TECHNOLOGY
  • [9] Ibach H., 1982, ELECTRON ENERGY LOSS
  • [10] SURFACE VIBRATIONS ON NI(110) - THE ROLE OF SURFACE STRESS
    LEHWALD, S
    WOLF, F
    IBACH, H
    HALL, BM
    MILLS, DL
    [J]. SURFACE SCIENCE, 1987, 192 (01) : 131 - 162