Spectroscopic study of nonresonant photon absorption by highly excited hydrogen atoms in a strong microwave field

Abstract

Hydrogen atoms with principal quantum number $n=10\mathrm{}$ have been laser excited to states between $n=44\mathrm{} \mathrm{and} 67$ in the presence of a strong microwave field whose frequency $\omega$ was adjustable between 5.9 and 8.0 GHz. The excitation probability has been studied as a function of $n$, $\omega$, microwave field strength and the number of microwave photons absorbed.