Abstract
We use Kepler maps to study the classical ionization of the hydrogen atom driven by electric fields; we compare the ionization rate (IR) due to chaotic motion (constant field amplitude) with the IR due to randomness (random field amplitude). We find that for weak fields the ionization due to random amplitude is more effective, while for strong fields the ionization due to chaos is more effective; so, there is a cross of such ionization curves. A physical explanation of this phenomenon, based on the trajectory behavior, is given.
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