# Closed-orbit theory of oscillations in atomic photoabsorption cross sections in a strong electric field. II. Derivation of formulas.

@article{Gao1992ClosedorbitTO, title={Closed-orbit theory of oscillations in atomic photoabsorption cross sections in a strong electric field. II. Derivation of formulas.}, author={Gao and Delos}, journal={Physical review. A, Atomic, molecular, and optical physics}, year={1992}, volume={46 3}, pages={ 1455-1467 } }

A formula for photoabsorptiion cross sections of hydrogen ans alkali-metal atoms in a static electric field is derived, based on the closed-orbit theory previously used to study hydrogen in a magnetic field. Electric fields are simpler than magnetic fileds, because the classical motion is regular and closed orbits can be enumerated. In alkali metals the core modifies the relevant dipole matrix elements, and it produces additional phase shifts

## 49 Citations

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The ionisation of Rydberg helium atoms in an electric field above the classical ionisation threshold has been examined using the semiclassical method, with particular emphasis on discussing the…

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