成鍵軌態(英語:Bonding orbital;Bonding molecular orbital),在分子軌態理論中被用來描述分子中兩個或多個原子原子軌態間的相互吸引作用理論化學中,軌態中的電子被描述成以的形式運動[1],當多個同相疊加時,原子軌態會線性地成鍵組合(constructive combination)成能量較低、電子密度集中在鍵合區域的分子軌態。分子軌態理論中,與成鍵軌態對應的概念為反鍵軌態非鍵軌態[2]


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