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 3 g+ j2 Y% q4 U, p. ^
COVER Overlayed scanning tunneling and atomic force microscopy images
1 J7 k. S$ n0 R; ^% L- T" Eof a single atom (width 1.3 nanometers): tunneling current (gray veil) and force 7 y" C" T l% y1 s& v
(colored surface) between a tungsten atom and a carbon monoxide molecule. The
! L$ w8 F2 P( `+ q/ I& Sforce shows a strong angular dependence and is attractive (blue minimum) in one
0 C$ B: D7 x8 C8 U0 ^( j ?direction and repulsive (dark red crescent) in others. The angular dependence of
/ R0 }6 t4 u" k6 r. Q( X* psingle chemical bonds determines the shape of molecules and crystals. See page # q, ~/ F! S7 G( ^
444.
1 M3 o+ }. e0 [* K) `! PImage: Joachim Welker, University of Regensburg 9 g- n* Y7 x6 p3 E- [' Y) ^* a, M
* _2 z+ R/ ^( g* p4 r# `
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发表于 2012-4-28 21:58
发表于 2012-4-29 00:00
