Intermanifold similarities in partial photoionization cross sections of helium

Details Intermanifold similarities in partial photoionization cross sections of helium Intermanifold similarities in partial photoionization cross sections of helium

2001-11-12

arxiv.org/abs/physics/0111100v1

Phys. Rev. A65, 042715 (2002)

Physics

Atomic Physics

10 pages, 10 figures, replacement with some typos corrected

Scientific paper

10.1103/PhysRevA.65.042715

Using the eigenchannel R-matrix method we calculate partial photoionization cross sections from the ground state of the helium atom for incident photon energies up to the N=9 manifold. The wide energy range covered by our calculations permits a thorough investigation of general patterns in the cross sections which were first discussed by Menzel and co-workers [Phys. Rev. A {\bf 54}, 2080 (1996)]. The existence of these patterns can easily be understood in terms of propensity rules for autoionization. As the photon energy is increased the regular patterns are locally interrupted by perturber states until they fade out indicating the progressive break-down of the propensity rules and the underlying approximate quantum numbers. We demonstrate that the destructive influence of isolated perturbers can be compensated with an energy-dependent quantum defect.

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