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! z$ @0 \2 e9 D z4 `: a( ]8 H$ ?: nCOVER Overlayed scanning tunneling and atomic force microscopy images
$ b# M6 k2 E9 Q$ u( G" y. Wof a single atom (width 1.3 nanometers): tunneling current (gray veil) and force
6 k/ S+ ~! Y( b$ P5 ]9 t l: N3 Q(colored surface) between a tungsten atom and a carbon monoxide molecule. The . H( B* i' t+ {& E! _
force shows a strong angular dependence and is attractive (blue minimum) in one , u1 [: b9 k# b$ {' J) d& Y
direction and repulsive (dark red crescent) in others. The angular dependence of : e5 x% m( Z- `& y* x8 C% z a( s
single chemical bonds determines the shape of molecules and crystals. See page . X& S7 |3 e3 ^; z
444.
) A6 J X/ v4 hImage: Joachim Welker, University of Regensburg : E3 r" f8 v3 f. A ]
, G- \+ `1 p9 d. t& J! r) M[hide][/hide] |
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发表于 2012-4-28 21:58
发表于 2012-4-29 00:00
