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1997•AIP conference proceedingsRequires access

Double photoionization of helium

Kurt W. Meyer, Chris H. Greene, B. D. Esry

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Abstract

The eigenchannel R-matrix method is combined with a finite element basis set to calculate double photoionization cross sections of helium for photon energies in the range 80–180 eV. These cross sections are calculated in the length, velocity, and acceleration gauge forms. The gauge discrepancies among the cross sections have been greatly reduced in comparison to previous results calculated with a hydrogenic basis. The ratio of double to single photoionization, a key parameter in characterizing electron correlations, is also presented and compared to recent theoretical and experimental values.

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What this paper is about

The eigenchannel R-matrix method is combined with a finite element basis set to calculate double photoionization cross sections of helium for photon energies in the range 80–180 eV. These cross sections are calculated in the length, velocity, and acceleration gauge forms. The gauge discrepancies among the cross sections have been greatly reduced in comparison to previous results calculated with a hydrogenic basis. The ratio of double to single photoionization, a key parameter in characterizing electron correlations, is also presented and compared to recent theoretical and experimental values.

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Available abstract

The eigenchannel R-matrix method is combined with a finite element basis set to calculate double photoionization cross sections of helium for photon energies in the range 80–180 eV. These cross sections are calculated in the length, velocity, and acceleration gauge forms. The gauge discrepancies among the cross sections have been greatly reduced in comparison to previous results calculated with a hydrogenic basis. The ratio of double to single photoionization, a key parameter in characterizing electron correlations, is also presented and compared to recent theoretical and experimental values.

Key concepts: Photoionization, Helium, Atomic physics, Physics, Electron, Range (aeronautics), Helium atom, Gauge (firearms)

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