THEORETICAL AND EXPERIMENTAL INVESTIGATION OF FORCE IMAGING AT THE ATOMIC-SCALE ON ALKALI-HALIDE CRYSTALS

被引:58
作者
SHLUGER, AL
WILSON, RM
WILLIAMS, RT
机构
[1] LATVIA UNIV, DEPT CHEM PHYS CONDENSED MATTER, RIGA 1098, LATVIA
[2] WAKE FOREST UNIV, DEPT PHYS, WINSTON SALEM, NC 27109 USA
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 07期
关键词
D O I
10.1103/PhysRevB.49.4915
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Assuming a model tip (Si4O10H10) as a reasonable representation of the surface of a Si3N4 cantilever stylus having a hydrogen-terminated asperity and a broader load-bearing base, we investigate the interaction of an atomic force microscope (AFM) with an alkali halide crystal by quantum chemical methods. Structural relaxation of the sample during engagement is allowed, and defect formation is investigated. Force curves above cation and anion positions are calculated, determining maximum sustainable loads and indicating a basis for atomic contrast. Experiments using a Si3N4 cantilever for AFM imaging of 12 alkali halide and alkaline earth fluoride crystals in air and desiccated helium are reported, in the widest AFM survey of such materials to date. Adsorbed water is shown to significantly enhance the observation of atomic periodicity on ionic halide samples, and rapid surface diffusion on alkali halide crystals is illustrated as it affects prospects for defect investigations. Observations of step edges and point-defect candidates at atomic scale are reported. The theoretical and experimental results are discussed together in the effort to provide a quantum-mechanical model for observations of alkali halide samples at atomic resolution, and to examine a possible basis for atomic resolution in the presence of long-range attractive forces.
引用
收藏
页码:4915 / 4930
页数:16
相关论文
共 65 条
  • [1] EFFECT OF TIP PROFILE ON ATOMIC-FORCE MICROSCOPE IMAGES - A MODEL STUDY
    ABRAHAM, FF
    BATRA, IP
    CIRACI, S
    [J]. PHYSICAL REVIEW LETTERS, 1988, 60 (13) : 1314 - 1317
  • [2] [Anonymous], 1970, APPROXIMATE MOL ORBI
  • [3] ADSORPTION OF WATER-VAPOR BY LITHIUM-FLUORIDE, SODIUM-FLUORIDE AND SODIUM-CHLORIDE
    BARRACLOUGH, PB
    HALL, PG
    [J]. SURFACE SCIENCE, 1974, 46 (02) : 393 - 417
  • [4] TIP-SAMPLE INTERACTION EFFECTS IN SCANNING-TUNNELING AND ATOMIC-FORCE MICROSCOPY
    CIRACI, S
    BARATOFF, A
    BATRA, IP
    [J]. PHYSICAL REVIEW B, 1990, 41 (05): : 2763 - 2775
  • [5] INSITU OBSERVATIONS OF OXYGEN-ADSORPTION ON A CU(100) SUBSTRATE USING ATOMIC FORCE MICROSCOPY
    CRUICKSHANK, BJ
    SNEDDON, DD
    GEWIRTH, AA
    [J]. SURFACE SCIENCE, 1993, 281 (1-2) : L308 - L314
  • [6] SIZE AND PACKING OF FULLERENES ON C60/C70 CRYSTAL-SURFACES STUDIED BY ATOMIC FORCE MICROSCOPY
    DIETZ, P
    FOSTIROPOULOS, K
    KRATSCHMER, W
    HANSMA, PK
    [J]. APPLIED PHYSICS LETTERS, 1992, 60 (01) : 62 - 64
  • [7] DIRECT OBSERVATION OF INDIVIDUAL FLUORINE IONS ON A SRF2(111) SURFACE BY ATOMIC FORCE MICROSCOPY
    DIETZ, P
    RAMOS, CA
    HANSMA, PK
    [J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 1992, 10 (02): : 741 - 743
  • [8] THE SEMI-EMPIRICAL APPROACH TO ELECTRONIC-STRUCTURE OF IONIC-CRYSTAL SURFACE
    ERMOSHKIN, AN
    KOTOMIN, EA
    SHLUGER, AL
    [J]. JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1982, 15 (04): : 847 - 861
  • [9] PROBLEM OF WATER ADSORPTION ON ALKALI-HALIDE CLEAVAGE PLANES, INVESTIGATED BY SECONDARY ION MASS-SPECTROSCOPY
    ESTEL, J
    HOINKES, H
    KAARMANN, H
    NAHR, H
    WILSCH, H
    [J]. SURFACE SCIENCE, 1976, 54 (02) : 393 - 418
  • [10] 2-DIMENSIONAL WATER CONDENSATION ON THE NACL(100) SURFACE
    FOLSCH, S
    STOCK, A
    HENZLER, M
    [J]. SURFACE SCIENCE, 1992, 264 (1-2) : 65 - 72