https://www.nist.gov/publications/tests-theory-rydberg-states-one-electron-ions
Tests of Theory in Rydberg States of One-electron Ions | NIST
Apr 8, 2026 - Comparison of optical frequency measurements to predictions of quantum electrodynamics (QED) for Rydberg states of one-electron ions can test theory and allow n
rydberg statesone electronteststheoryions