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Frankfurt 2006 – scientific programme

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A: Atomphysik

A 22: Poster II: Photoionisation

A 22.2: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

The search for oscillations in the near-threshold double photoionization cross section of helium — •U Kleiman1,2, T Topçu1, M S Pindzola1, and F Robicheaux11Auburn University, Department of Physics, Auburn, AL 36849, USA — 2Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden, Germany

The double photoionization cross section for helium is calculated in the near-threshold region by direct solution of the time-dependent Schrödinger equation. Full close-coupling results for the 1s2 1S ground state are found to be in excellent agreement with experimental measurements [1]. The calculations confirm the validity of the Wannier power law from 0.1 eV to about 1.7 eV excess energy and find no oscillations in the threshold cross section beyond numerical uncertainty. Further time-dependent calculations are made in a simpler s-wave counterlinear model for both the 1s2 1S ground and 1s2s 1S excited states. Although numerical uncertainties are significantly reduced in the helium model calculations, again no oscillations in the threshold cross sections are found beyond the remaining numerical uncertainty.
H Kossmann, V Schmidt and T Andersen, Phys. Rev. Lett. 60, 1266 (1988).

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