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Surface states in the band gaps of free-electronlike s, p bands are common to many surfaces.Predicted already in 1939 by Shockley,such states have been observed in photoemission from a wide class of metal surfaces. A very special case arises when such states are located in a gap which contains the vacuum level.   ÎÒÏëÇë½Ìһϸ÷룬Õâ¶Î»°×îºóÒ»¾äÔõôÀí½â£¬¾ÍÊÇa gap which contains the vacuum level¡£Ï£ÍûÖªµÀµÄÈËÃǰï¸ö棬×î½ü¿´ÎÄÏ׺ÜÍ·Í´
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A very special case arises when such states are located in a gap which contains the vacuum level.
ÓÐÒ»ÌØÊâµÄÀý×Ó¾ÍÊÇ®”ß@‚€ surface state ÂäÔÚ gap ÑeÇÒͬ•r vacuum sate Ò²ÔÚ gap Ñe

vacuum state ÔÚ²»Í¬±íÃæÏµ½yÏÂ
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¿ÉÄÜ•þÔÚ CBM ÉÏ (positive electron affinity)
Ò²¿ÉÄÜ•þÔÚ VBM Ï (negative electron affinity)
®”È»£¬Ò²ÊÇÓпÉÄܳö¬FÔÚ gap Ñe
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http://en.wikipedia.org/wiki/Electron_affinity
3Â¥2014-11-25 16:12:10
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