磁共振(Magnetic resonance)是指具有磁矩的微觀粒子體系在恆定外磁場中,磁矩相對於磁場方向只能取幾種量子化的方位;若垂直於恆定磁場方向加一交變磁場,在適當條件下能改變磁矩的方位,使磁矩體系選擇地吸收特定頻率的交變磁場能量的現象。

是自旋磁共振現象;其意義上較廣,包含有:

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