Seeing the atomic orbital: First-principles study of the effect of tip termination on atomic force microscopy

Physical Review Letters

Volumn 90, Issue 25 I, 2003, Pages 2561011-2561014

  Huang, Minghuang ^a   Čuma, Martin ^b   Liu, Feng ^a  

^a UNIVERSITY OF UTAH   (United States)

^b UNIVERSITY OF UTAH   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC FORCE MICROSCOPY; CHEMICAL BONDS; IMAGING TECHNIQUES; SCANNING ELECTRON MICROSCOPY;

ATOMIC ORBITALS;

ATOMIC PHYSICS;

EID: 0041766732     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

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21. m = 2.3 A, Fig. 3(f)]. This is because in the Si(111) tip, the vertical separation between the apex atom and its three nearest neighbors is ∼0.78 Å. Consequently, its neighbors can also interact with the surface adatom when the tip-surface distance is short. Because of the specific tip orientation used with respect to the surface, it turns out when the tip is placed at the upper-right corner of the in-plane grid, the interaction between one of the neighbors and the adatom becomes the dominating interaction at a short tip-surface distance, causing the shift of the maximum from the center [Fig. 3(d)] to the upper-right corner (Figs. 3(c) and 3(e)]. Looking carefully at Fig. 3(e), there is actually a very weak second maximum at the center.
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