Nuclear magnetic resonance spectroscopy energy difference between spin states

Nuclear magnetic resonance spectroscopy, commonly known as NMR spectroscopy, is a technique that exploits the magnetic properties of certain atomic nuclei to determine physical and chemical properties of atoms, and in turn, the molecules in which they are contained. It is based on nuclear magnetic resonance and can provide detailed information about the structure of molecules. It is applicable to a sample containing nuclei with resultant nuclear spin. When such a nucleus is placed in a strong magnetic field, transitions occur between different spin energy states of the nucleus due to the absorption of frequencies. 

Nuclear magnetic resonance (NMR) spectroscopy is concerned with the energies of the nuclear spin states and the transitions that are possible between different states. To work out the energies of the states, we need to understand the interactions that affect nuclear spin state energies and to develop an appropriate Hamiltonian. 

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