Abstract
Spin resonance spectroscopy deals with the nuclear and electron spin resonance absorptions in the radio and microwave frequencies used for investigating diamagnetic (I≥1/2) and paramagnetic (S≥1/2) systems, respectively. This chapter focuses on the theory of nuclear magnetic resonance (NMR), its instrumentation, and comparison with electron paramagnetic resonance spectroscopy. The parameters obtained from NMR viz., chemical shift and spin–spin splitting including their types (first and second orders), characteristics, and mechanisms (dipolar and indirect scalar coupling) are discussed. Furthermore, the classification of NMR systems including chemically and magnetically equivalent nuclei is presented. The simplification techniques for complex NMR spectra are also highlighted. It also includes the principles of pulse and Fourier transform NMR and different methods viz., free induction decay, saturation recovery, spin echo (SE), inversion recovery, and stimulated SE to investigate the relaxation process and times. The time evolution of magnetization is described by Bloch equation. The different lineshapes and factors affecting line width are also discussed.
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