6: Lecture 6: The Spin Hamiltonian
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Published:13 Jun 2022
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Special Collection: RSC eTextbook CollectionProduct Type: Textbooks
Lectures On Spin Dynamics: The Theoretical Minimum, The Royal Society of Chemistry, 2022, pp. 70-86.
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In this lecture, I discuss the generic form of the nuclear spin Hamiltonian using the irreducible spherical tensor formalism presented in Lecture 4. I use the argument that the direct interaction between the spin and the static field is often the largest one, to approximate the spin Hamiltonian into a simpler form by invoking the perturbation theory that is presented in Lecture 5 (secular approximation). I then derive the explicit form of the Hamiltonians that represent each of the most frequently encountered interactions in spin dynamics. Finally, I discuss the effect of molecular motions and derive the form of the nuclear spin Hamiltonian in isotropic liquids.