ABSTRACT
This chapter deals with the origins and properties of the nitroxide spin-Hamiltonian parameters: hyperfine tensors, g-tensors and nuclear quadrupole couplings. Isotropic hyperfine couplings depend on the unpaired electron spin density at the nucleus; anisotropic hyperfine couplings are determined by the interaction between the magnetic dipoles of the nucleus and electron. Anisotropy of the electron g-tensor (relative to for a free electron) is determined by residual orbital angular momentum that is not quenched entirely by chemical bonding in the nitroxide. Nuclear quadrupole couplings (for) depend on the electric field gradient created by the electron cloud at the nucleus and therefore reflect chemical bonding in the nitroxide. A valuable summary is given in the concluding section of the chapter. Appendices C, F, K and L at the end of the book are directly relevant to this chapter.
