Abstract
The role of exchange core-polarization (ECP) effects in the study of indirect nuclear spin interactions (INSI) in the alkali metals rubidium and cesium is discussed. The ECP contributions to the INSI parameters ${A}_{12}$ (Ruderman-Kittel) and ${B}_{12}$ (pseudodipolar) are evaluated and compared with other contributions. The theoretical values of ${A}_{12}$ are in reasonable agreement with experiment. However, the incorporation of the ECP contributions to ${B}_{12}$, ${({B}_{12})}_{\mathrm{ECP}}^{\mathrm{dip}}$ (in this ECP process, the conduction electrons are polarized by the electron-nuclear dipolar interaction, and the exchanged polarized core electrons interact with the nucleus via the Fermi contact interaction) does not improve the order-of-magnitude disagreement between theory and experiment. The importance of additional ECP processes whose inclusion can improve the theoretical situation is briefly discussed.
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