THE $4^{3} \Delta_{g}$ STATE IN $K_{2}$ - INVESTIGATING A POSSIBLE GATEWAY TO CORE NON-PENETRATING RYDBERG STATES

Author Institution: Department of Physics, United States Military Academy; Department of Physics, Temple University; Department of Chemistry, University of Illinois at Chicago; Key Lab Atom and Molecular Nanoscience, Tsinghua University; Laboratoire de Physique des Atomes, Lasers, Mol\'{e}cules et Surfaces, (PALMES), CNRS et Universit\'{e}; Laboratoire de Spectrom\'etrie Ionique et Moleculaire (L.A.S.I.M), CNRS et Universit\'e Lyon (UMR5579)Core non-penetrating Rydberg states can give useful information on the electronic structure of the ion core; however, core non-penetrating states are difficult to observe since these states hardly penetrate the more accessible ion core and the electronic angular momentum quantum number, l, is large, for the core non-penetrating states thus the transition dipole moment to the core non-penetrating states is small. The core penetrating $4^{3} \Delta_{g}$ state (atomic limit: $4s+5d$) and the core non-penetrating $3^{3}\Delta_{g}$ state (atomic limit: $4s+4f$) perturb each other since they have the same symmetry and overlapping energy states thus creating the possibility of a gateway to other core non-penetrating states