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VOLUME 47 (1988) | ISSUE 9 | PAGE 445
Oscillation of the photoabsorption near the ionization threshold for hydrogen-like atoms in electric and magnetic fields
The cross section for the photoabsorption by atoms in weak electric and magnetic fields near the ionization threshold is found to contain some oscillating components associated with the unstable periodic paths. These components are expressed in terms of the parameters of the periodic paths. The results are in good agreement with the experimental data.