Recent advances in NMR spectroscopy allow one to study extremely dilute systems or nuclei which occur in low natural abundance and/or have poor sensitivity for NMR detection. This paper describes various pulse and pulse Fourier transform NMR techniques. Included in this introduction are: (1) a brief review of the nuclear relaxation phenomenon, (2) sensitivity enhancement using the pulse technique, (3) pulse instrumentation, and (4) the analytical applications of pulse Fourier transform NMR.
Daniel A. Netzel, "Pulse Fourier Transform Nuclear Magnetic Resonance Spectroscopy," Appl. Spectrosc. 26, 430-442 (1972)