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A fully classical explanation of the nonhydrogenic ionization threshold forlow angular momentum Rydberg states of Alkali-metal atoms in a linearlypolarized low frequency monochromatic microwave field is given: the classicalequivalent to the quantum rate-limiting step, which is responsible for then^(-5) scaling and which according to the literature initiates what thencontinues as essentially classical diffusion, is found.Comment: 10 pages, 9 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Ionization of Rydberg alkali-metal atoms in quasistatic electric fields: A classical view of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>n</mml:mi><mml:mrow><mml:mo>−</mml:mo><mml:mn>5</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>scaling of the threshold field

Ionization of Rydberg alkali-metal atoms in quasistatic electric fields: A classical view of then−5scaling of the threshold field