略語大辞典 [Phys] 28 SFA strong field approximation 強い場近似. 強電場近似. 原子の光電離に関する理論.strong field approximation; a theory of photoionization of atoms, based only on the premise of the strength of the ionizing field as compared to the strength of the atomic binding; a relativistic theory of photoionization of 丸善「略語大辞典」JLogosID : 11859302