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Physics Letters A

Stark width and shift dependence on the ionization potential

Jagoš Purić, I. S. Lakićević, V. Glavonjić

Published Mar 1, 1980• 18 citations
Publisher
DOI
10.1016/0375-9601(80)90590-3

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Physica Scripta•Sep 7, 2006•9 citations
An investigation is made of the influence of spatial inhomogeneity of the electromagnetic field on the process of resonance ionization of atoms. It is shown that the result of averaging over the spatial distribution of the field depends on the mechanism for formation of a dispersion dependence of the ionization probability on the radiation frequency. For all known initiating mechanisms, analytic expressions are derived to determine the line profile of the dispersion curve in a spatially inhomogeneous field having a Gaussian distribution over the transverse coordinate. It is found that if the extreme value of the energy shift of the transition due to the dynamic Stark effect αF02 is greater than the width of the dispersion curve in a homogeneous field, allowance for spatial inhomogeneity results in additional broadening of the dispersion curve, its actual order-of-magnitude width being αF02.
The resonance enhancements marking the ATI spectrum of argon are discussed in the light of a recently compiled map of the quasienergies of this atom. Many of the dressed excited states of interest shift nonponderomotively in complicated ways, but keep an ionization width narrow enough to produce sharp substructures of both low and high ATI peaks through Stark-shift induced resonances. The most prominent enhancement observed in the high-order ATI peaks originates from ionization from the dressed ground state perturbed by the influence of neighbouring resonant dressed states.