Details

Autor(en) / Beteiligte

• HINO, K.-I
• ISHIHARA, T
• SHIMIZU, F
• TOSHIMA, N
• MCGUIRE, J. H

Titel

Double photoionization of helium using many-body perturbation theory

Ist Teil von

• Physical review. A, Atomic, molecular, and optical physics, 1993-08, Vol.48 (2), p.1271-1276

Ort / Verlag

College Park, MD: American Physical Society

Erscheinungsjahr

1993

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Cross sections for double photoionization of He are calculated using the lowest-order many-body perturbation theory. There are three amplitudes contributing in the present calculation. They represent the three mechanisms for double ionization, namely, two-step-1, shake off, and ground-state correlation. It is explicitly shown that the cross section for each of these mechanisms depends strongly on the adopted form of the dipole interaction as indicated by Dalgarno and Sadeghpour [Phys. Rev. A 46, 3591 (1992)]. Our final results obtained by the sum of three amplitudes do not depend on the choice of the dipole formula at photon energies above 1 keV. The ratios of the cross sections for double ionization to single ionization are in excellent agreement with recent experimental results at energies 2--12 keV.