Recoil-ion momentum distributions for two-photon double ionization of He and Ne by 44 eV free-electron laser radiation

被引:130
|
作者
Rudenko, A. [1 ,2 ]
Foucar, L. [3 ]
Kurka, M. [2 ]
Ergler, Th. [2 ]
Kuehnel, K. U. [2 ]
Jiang, Y. H. [2 ]
Voitkiv, A. [2 ]
Najjari, B. [2 ]
Kheifets, A. [4 ]
Luedemann, S. [2 ]
Havermeier, T. [3 ]
Smolarski, M. [3 ]
Schoessler, S. [3 ]
Cole, K. [3 ]
Schoeffler, M. [3 ]
Doerner, R. [3 ]
Duesterer, S. [5 ]
Li, W. [5 ]
Keitel, B. [5 ]
Treusch, R. [5 ]
Gensch, M. [5 ]
Schroeter, C. D. [2 ]
Moshammer, R. [1 ,2 ]
Ullrich, J. [1 ,2 ]
机构
[1] CFEL, Max Planck Adv Study Grp, D-22607 Hamburg, Germany
[2] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[3] Univ Frankfurt, Inst Kernphys, D-60486 Frankfurt, Germany
[4] Australian Natl Univ, Res Sch Phys Sci, Canberra, ACT 0200, Australia
[5] DESY, D-22607 Hamburg, Germany
关键词
D O I
10.1103/PhysRevLett.101.073003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Recoil-ion momentum distributions for two-photon double ionization of He and Ne (h omega=44 eV) have been recorded with a reaction microscope at FLASH (the free-electron laser at Hamburg) at an intensity of similar to 1x10(14) W/cm(2) exploring the dynamics of the two fundamental two-photon-two-electron reaction pathways, namely, sequential and direct (or nonsequential) absorption of the photons. We find strong differences in the recoil-ion momentum patterns for the two mechanisms pointing to the significantly different two-electron emission dynamics and thus provide serious constraints for theoretical models.
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页数:4
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