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脉冲式NMR实验讲义初稿)（台湾清华大学）
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?????NMR??齲?????)??????廪?????理? ??????理?????? 1 1.1 Theory 1.1.1 Introduction The response of a nuclear magnetic spin system polarized by a constant magnetic field B0 to a radio-frequency (RF) pulse, whose spectrum covers the resonance frequency of spins, is known as ??Free Induction Decay?? (FID). ??Free?? refers to the fact that nuclear spins precess freely in the presence of a polarizing, constant magnetic field B0 - but without the presence of an RF field. The FID signal is of fundamental importance for pulse NMR spectroscopy as this time-domain signal Fourier transformation leads directly to the frequency-domain NMR spectrum. |
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