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量子力學中,如果一個粒子在某勢場中被約束在一個或幾個空間區域內,則稱粒子處於束縛態(英語:bound state)。如果勢場在無窮遠處趨於零,則負能量態一定是束縛態。束縛態粒子的能譜離散的,而自由粒子的能譜是連續的。[1]

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