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Journal Article

#### Dynamics of He double ionization in the non-perturbative regime: the reduction to an effective three-particle problem

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##### Citation

Perumal, A. N., Moshammer, R., Schulz, M., & Ullrich, J. (2002). Dynamics of He
double ionization in the non-perturbative regime: the reduction to an effective three-particle problem.*
Journal of Physics B-Atomic Molecular and Optical Physics,* *35*(9), 2133-2147.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-8346-C

##### Abstract

Double ionization of He by 3.6 MeV u(-1) Au53+ impact is investigated in a kinematically complete experiment using an integrated multi-electron recoil-ion momentum spectrometer (reaction microscope). Surprisingly, the final-state correlation between the recoiling He2+ target ion momentum and the momenta of both emitted electrons is found to be the strongest among the various two-body correlations. On this basis it is demonstrated that the four-body momentum balance can be reduced to a good approximation to an effective three- particle problem by considering the centre-of-mass motion of the two electrons instead of their individual momenta. Then, all essential dynamical features observed for single ionization earlier, like for example a strong forward-backward asymmetry in the longitudinal momentum balance resulting from the final- state interaction with the projectile, are naturally rediscovered. Moreover, important conclusions on the properties of the TS-2 double ionization mechanism are drawn.