A phenomenon used as one method for observing nuclear magnetic resonance (nuclear spin resonance) or electron spin resonance. In the most commonly used method, a high frequency wave is applied to a spin in a static magnetic field to rotate the magnetization by 90 degrees in a rotating coordinate system (90-degree pulse), and then a 180-degree pulse is applied t seconds later ( 2t seconds after the first pulse), and the phases match and free induction decay is observed. The name comes from the fact that the signal initiated by the first pulse is reversed by the second pulse and returns to the starting point, resembling an echo. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
核磁気共鳴(核スピン共鳴)または電子スピン共鳴を観測するための一方法として利用される現象。最もよく利用される方法では,静磁場中のスピンに回転座標系内で磁化を90度倒すような高周波を入射(90度パルス)し,t秒後に180度パルスをかけると,そのt秒後(初めのパルスから2t秒後)に位相が一致して自由誘導減衰が観測される。第1のパルスによって開始された信号が第2のパルスによって逆行して出発点に戻る様子がエコー(こだま)に似ているところからこの名がある。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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