Fittinghoff, D. N.
Bolton, P. R.
Chang, B.
Kulander, K. C.
1992-11-02
We have measured the ion yields for helium ionized by 120 fs, 614 nm laser pulses for intensities near 1016 W/cm2. We have found that for these ultrashort pulses the He+2 data exhibit a feature which saturates in parallel with the He+ signal indicating that the ionization may proceed nonsequentially. We propose a new mechanism, which can exist only in the tunneling regime, for such nonsequential ionization.
https://doi.org/10.1103/physrevlett.69.2642
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Observation of nonsequential double ionization of helium with optical tunneling
info:eu-repo/semantics/article