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R. Pazourek, J. Feist, S. Nagele, J. Burgdörfer:
"Attosecond Streaking of Correlated Two-Electron Transitions in Helium";
Physical Review Letters, 108 (2012), 163001; S. 163001-1 - 163001-5.

We present fully ab initio simulations of attosecond streaking for ionization of helium accompanied by shakeup of the second electron. This process represents a prototypical case for strongly correlated electron dynamics on the attosecond time scale. We show that streaking spectroscopy can provide detailed information on the Eisenbud-Wigner-Smith time delay as well as on the infrared-field dressing of both bound and continuum states. We find a novel contribution to the streaking delay that stems from the interplay of electron-electron and infrared-field interactions in the exit channel. We quantify all the contributions with attosecond precision and provide a benchmark for future experiments.

http://dx.doi.org/10.1103/PhysRevLett.108.163001