"Version: 20191001"--Title page verso.Includes bibliographical references.1. Introduction -- 2. Quantum hydrogenic atoms or ions in a high-frequency laser field -- 3. Classical (Rydberg) hydrogen atoms in a high-frequency laser field : celestial analogies -- 4. Rydberg states of muonic-electronic helium atoms or helium-like ions -- 5. A circumbinary planet around a binary star in Einstein's gen…