Abstract
Abstract We have performed exact numerical calculations of the photoionization of highly excited parabolic states of hydrogen in the region of the zero field ionization limit (E ∼ 0) in an external electric field. We present results for the photoionization of blueshifted m=0 initial states (n2=0) by both π and σ polarized light. For highly excited initial states, the effects of the overlap of the initial and final state charge distributions become dominant in determining which final states will be excited, leading to approximate selection rules. The broad resonances in the photoionization spectrum near E=0 are shown to be dramatically enhanced and narrowed, resulting in the appearance of essentially isolated resonances in π polarization. In contrast to the situation for photoionization of low-lying states, large resonances are also predicted to be present in σ polarization.
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