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Phys. Rev. A 61, 030704(R) (2000) [4 pages]

Near-threshold triple-photoionization cross section of lithium

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R. Wehlitz*,†
Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan

T. Pattard
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200

M.-T. Huang
Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan

I. A. Sellin
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200

J. Burgdörfer
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200
Institute for Theoretical Physics, Vienna University of Technology, A1040 Vienna, Austria

Y. Azuma
Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan

Received 15 November 1999; published 9 February 2000

The triple-photoionization cross section of atomic Li was measured near its threshold. Our results can be described by a threshold power law up to ≈5 eV with an exponent of 2.05(25) which is consistent with a previous experiment and theoretical predictions. At higher energies, we find that the cross section is well described by the threshold law for double ionization. The present analysis is based on the notion that for sufficient excess energy, triple photoionization of Li is reasonably well described by a double ionization of the inner electrons followed by a shakeoff of the outer electron.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.61.030704
DOI:
10.1103/PhysRevA.61.030704
PACS:
32.80.Fb

*Electronic address: rwehlitz@src.wisc.edu

†Present address: Synchrotron Radiation Center, 3731 Schneider Dr., Stoughton, WI 53589.

 
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