Yoakum

Stueckelberg oscillations in the multiphoton excitation of helium Rydberg atoms: Observation with a pulse of coherent field and suppression by additive noise.

Koch, L. Sirko, P. Koch, 1992, Physical review letters.

Microwave multiphoton ionization and excitation of helium Rydberg atoms.

Mariani, Koch, Sauér, 1990, Physical review. A, Atomic, molecular, and optical physics.

Microwave-driven He Rydberg atoms: Floquet-state degeneracy lifted by a second frequency, Stueckelberg oscillations, and their destruction by added noise.

Koch, Haffmans, Yoakum, 1993, Physical review. A, Atomic, molecular, and optical physics.

Dynamic tunneling ionization of excited hydrogen atoms: A precise experiment versus theories.

Richards, Koch, Sauér, 1992, Physical review letters.