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The complete Zeeman and hyperfine (dipole, quadrupole, and octupole) matrices are given for an (sl) configuration in intermediate coupling. From these are derived the second-order corrections to the zero-field hyperfine intervals for an (sp) configuration. In addition, we obtain the corrections appropriate to the crossing of certain of the hyperfine Zeeman levels of an (sp) ³P₁ state for atoms with spin-{} and spin-3/2 nuclei.
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Lurio et al. (1962) studied this question.
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