Abstract
In this, the second of two papers, we derive general quantum formulas for the photodetachment cross section for ${\mathrm{H}}^{\mathrm{\ensuremath{-}}}$ in perpendicular electric and magnetic fields. The results are valid for any polarization and can be reduced to the semiclassical results of the first paper [A. D. Peters and J. B. Delos, Phys. Rev. A 47, 3020 (1993)]: a smooth background plus oscillatory terms. This connection between the quantum and semiclassical results is made using a stationary-phase approximation and it is shown that each stationary-phase point corresponds to a closed orbit.
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