molecular Rydberg state

https://dx.doi.org/10.1351/goldbook.MT07071
An excited electronic state which is composed primarily of atomic orbitals with principal quantum numbers greater than that of the ground state and the valence excited states. Such electronic states typically have a large polarizability.
Source:
PAC, 1999, 71, 1919 (Glossary of terms used in theoretical organic chemistry) on page 1952