Polyatomic Cs-NO Rydberg Molecules Including Short-Range, Non-Dipolar Interactions

A Rydberg molecule forms when an electron orbit of a highly excited atom encompasses a ground state perturber such as another atom or molecule. This interaction between the electron and the perturber can weakly bind the two objects together. In this work we examine the Rydberg molecules formed when the ground state perturber is a diatomic molecule, specifically nitrogen oxide.  Unlike an atom, a diatomic molecule has different states that respond differently to the electric fields of the Rydberg system.  Earlier studies of similar systems have treated the electron-molecule interaction as a pure charge-dipole potential.  In this work we include an additional contact interaction to simulate the non dipolar, short-range component of the interaction.   We examine how this additional term affects the structure of Born-Oppenheimer potentials of the Rydberg molecule.