R Wehlitz and S B Whitfield 2001 J. Phys. B: At. Mol. Opt. Phys. 34 L719 doi:10.1088/0953-4075/34/22/103
R Wehlitz1 and S B Whitfield2
Show affiliationsWe have measured the double-to-single photoionization ratio of beryllium (1s22s2) between 32 and 80 eV and compare our data with the electron-impact ionization cross section of Be+. In this energy region only simultaneous but not sequential emission of both 2s electrons can take place. We also compare our data with the double-to-single photoionization ratios of He, H2 and Li and find surprisingly good agreement of the photon-energy dependence if the ratio is scaled appropriately. The double-to-single photoionization ratio is lower for Be than for He due to a weaker electron-electron interaction between the valence electrons.
32.80.Fb Photoionization of atoms and ions
34.80.Dp Atomic excitation and ionization
07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment
Issue 22 (28 November 2001)
Received 14 August 2001, in final form 27 September 2001
Published 9 November 2001
R Wehlitz and S B Whitfield 2001 J. Phys. B: At. Mol. Opt. Phys. 34 L719
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