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Physics  1997 

Hundred photon microwave ionization of Rydberg atoms in a static electric field

DOI: 10.1103/PhysRevA.57.1987

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We present analytical and numerical results for the microwave excitation of nonhydrogenic atoms in a static electric field when up to 1000 photons are required to ionize an atom. For small microwave fields, dynamical localization in photon number leads to exponentially small ionization while above quantum delocalization border ionization goes in a diffusive way. For alkali atoms in a static field the ionization border is much lower than in hydrogen due to internal chaos.


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