Combination of isotropy and anisotropy Since any orbital may be considered as a hybrid of suitable combinations of s, p or d orbitals, so also may a hyperfine coupling be divided into a contribution arising from p or d orbitals (anisotropic) and s orbitals (isotropic). In general both isotropic and anisotropic hyperfine couplings occur when one or more nuclei with 1 0 are present in the system. The whole interaction is therefore dependent on orientation and must be expressed by the second rank A tensor as given in Equation [13]. The A tensor may be split into an anisotropic and isotropic part as follows [Pg.452]

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