Two-photon double ionization of helium above and below the threshold for sequential ionization

被引：105

作者：

Horner, D. A.

Morales, F.

Rescigno, T. N.

Martin, F.

McCurdy, C. W.

机构：

[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[2] Univ Autonoma Madrid, Dept Quim C9, E-28049 Madrid, Spain

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] Univ Calif Davis, Dept Appl Sci, Davis, CA 95616 USA

[5] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW A | 2007年 / 76卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.76.030701

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present accurate cross sections for two-photon double ionization of helium at photon energies above and below the threshold for sequential double ionization. Above this threshold (54.4 eV), sequential ionization competes with nonsequential ionization. Remarkably, even below 54.4 eV, sequential ionization leaves a clear signature in the magnitude and shape of both the total and energy-sharing cross sections-even though at these energies it is only a virtual process.

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页数：4

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