Physical Mechanisms and Scaling Laws of K-Shell Double Photoionization

Journal Article · Fri Feb 20 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.073006· OSTI ID:21180220

Hoszowska, J; Dousse, J -Cl; Berset, M; Cao, W; Fennane, K; Kayser, Y; Szlachetko, J; Szlachetko, M ^[1]; Kheifets, A K ^[2]; Bray, I ^[3]; Kavcic, M ^[4]

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1. Department of Physics, University of Fribourg, CH-1700 Fribourg (Switzerland)
2. Research School of Physical Sciences, Australian National University, ACT 0200 Canberra (Australia)
3. ARC Centre for Matter-Antimatter Studies, Curtin University, WA 6845 Perth (Australia)
4. J. Stefan Institute, SI-1001, Ljubljana (Slovenia)

We report on the photon energy dependence of the K-shell double photoionization (DPI) of Mg, Al, and Si. The DPI cross sections were derived from high-resolution measurements of x-ray spectra following the radiative decay of the K-shell double vacancy states. Our data evince the relative importance of the final-state electron-electron interaction to the DPI. By comparing the double-to-single K-shell photoionization cross-section ratios for neutral atoms with convergent close-coupling calculations for He-like ions, the effect of outer shell electrons on the K-shell DPI process is assessed. Universal scaling of the DPI cross sections with the effective nuclear charge for neutral atoms is revealed.

• OSTI ID: 21180220
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC NUMBER
CROSS SECTIONS
ELECTRON-ELECTRON INTERACTIONS
ELECTRONS
ENERGY DEPENDENCE
K SHELL
PHOTOIONIZATION
PHOTONS
RADIATIVE DECAY
SCALING LAWS
VACANCIES
X-RAY SPECTRA