中国物理B ›› 1993, Vol. 2 ›› Issue (2): 128-138.doi: 10.1088/1004-423X/2/2/006

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

ATOMIC CHARGE SUPERPOSITION CALCULATIONS OF STM IMAGES OF 2D-ORDERED AMINO ACID ADSORBATES(Ⅰ)

李燕芳, 牟建勋, 严隽珏, 杨威生   

  1. Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:1992-05-05 出版日期:1993-02-20 发布日期:1993-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China and the Doctoral Program Foundation of Institute of Higher Education.

ATOMIC CHARGE SUPERPOSITION CALCULATIONS OF STM IMAGES OF 2D-ORDERED AMINO ACID ADSORBATES(Ⅰ)

LI YAN-FANG (李燕芳), MOU JIAN-XUN (牟建勋), YAN JUN-JUE (严隽珏), YANG WEI-SHENG (杨威生)   

  1. Department of Physics, Peking University, Beijing 100871, China
  • Received:1992-05-05 Online:1993-02-20 Published:1993-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China and the Doctoral Program Foundation of Institute of Higher Education.

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摘要： In a previous STM investigation by Yang and co-workers a variety of 2D ordered atomic-scale features of glycine molecules adsorbed on graphite were observed and several models have been proposed to interpret these features. In the present work, atomic charge superposition(ACS) calculations of STM images of their models were carried out. The calculated images match the experimental ones fairly well, indicating the general validity of the ACS method to the glycine/graphite system and the correctness of their interpretations. The reason of the validity, the origin of the atomic resolution, and the proper tip-sample distance are also discussed.

Abstract: In a previous STM investigation by Yang and co-workers a variety of 2D ordered atomic-scale features of glycine molecules adsorbed on graphite were observed and several models have been proposed to interpret these features. In the present work, atomic charge superposition(ACS) calculations of STM images of their models were carried out. The calculated images match the experimental ones fairly well, indicating the general validity of the ACS method to the glycine/graphite system and the correctness of their interpretations. The reason of the validity, the origin of the atomic resolution, and the proper tip-sample distance are also discussed.

中图分类号:  (Adsorbate structure (binding sites, geometry))

  • 68.43.Fg
82.65.+r (Surface and interface chemistry; heterogeneous catalysis at surfaces) 87.15.R- (Reactions and kinetics) 87.15.A- (Theory, modeling, and computer simulation)