Phys. Rev. Lett. 93, 023003 (2004) [4 pages]Unexpected Behavior of the Near-Threshold Double-Photoionization Cross Section of BerylliumReceived 9 December 2003; published 7 July 2004 The threshold region of the double-photoionization cross section of atomic beryllium was investigated using monochromatized synchrotron radiation. The photon energy dependence of the double-photoionization cross section can be described by the Wannier power law up to 1.7 eV above threshold. However, we unexpectedly find oscillations in the cross section, which are in excellent agreement with a modulated threshold law based on the Coulomb-dipole theory [ A. Temkin Phys. Rev. Lett. 49 365 (1982)]. This new finding casts some doubts on the general applicability of the Wannier power law. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.023003
DOI:
10.1103/PhysRevLett.93.023003
PACS:
32.80.Fb
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