Relabeling of the K2 Rydberg States

The K2 electronic states calculated theoretically and/or observed experimentally have been relabeled according to their dominant hydrogenic nl? characters of the Rydberg orbitals. These states can be divided into core-penetrating and core-nonpenetrating states. This classiˉcation provides physical insights for interpreting and predicting experimental observations. The application of this method to K2 is compared with that to Na2 and Li2.