Breakdown of the Independent Electron Approximation in Sequential Double Ionization
Correlated electron emission in strong field double ionization is dominated by recollision of the first ionized electron with its parent ion. With laser pulses that are close to circularly polarized, recollision may be greatly modified or avoided and the electrons are usually assumed to be field ionized without mutual interaction. Here we present coincidence momentum measurements of the doubly charged ion and the two electrons that are in contradiction with the independent electron assumption for close to circularly polarized fields. These experiments demonstrate that recollision is not the only mechanism that can lead to correlated electron emission in strong field double ionization.
KeywordsElectron Emission Electron Correlation Polarization Axis Double Ionization Minor Polarization
This work was supported by the NCCR Quantum Photonics (NCCR QP), a research instrument of the Swiss National Science Foundation (SNSF), by ETH Research Grant ETH-03 09-2, the SNSF REquip grant 206021-128551/1, and by US DOE Grant ER-FG02-05ER15713. R.D. acknowledges support by a Koselleck Project of the Deutsche Forschungsgemeinschaft.
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