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3 Y+ s7 M9 j& [ D% v5 O* oCOVER Overlayed scanning tunneling and atomic force microscopy images
1 G {. L8 U/ n4 Tof a single atom (width 1.3 nanometers): tunneling current (gray veil) and force
! B. w; x. x# L: m- Q8 r) {3 |! [(colored surface) between a tungsten atom and a carbon monoxide molecule. The : S: X/ J8 S: T/ I4 H
force shows a strong angular dependence and is attractive (blue minimum) in one
l6 L. v1 i( \( Sdirection and repulsive (dark red crescent) in others. The angular dependence of
8 m; Y7 h }3 Asingle chemical bonds determines the shape of molecules and crystals. See page $ A/ b/ V* \. }3 I& _ E6 J
444.
5 N: E; G- v* ~! _Image: Joachim Welker, University of Regensburg
) ^. p, m0 u, T4 H$ u5 {; }3 r, G! Y) i; U
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发表于 2012-4-28 21:58
发表于 2012-4-29 00:00
