Diffusionlike Aspects of Multiphoton Absorption in Electrically Polarized Highly Excited Hydrogen Atoms

We have observed microwave transitions of overall order up to 16 in hydrogen atoms initially in $n=60$ lowest-energy Stark states. Increases in $n$ as large as 4 occur with little change in the electric quantum number ${n}_{e}$. Thus hydrogen atoms electrically polarized along the direction of a strong linearly polarized microwave electric field respond one-dimensionally to this field by maintaining their polarization. At some microwave frequencies the final-state $n$ distribution is smooth above threshold field values estimated for stochastic transitions.

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