Abstract
Nonsequential double ionization of Ar by 45 fs laser pulses (800 nm)
at (4-7) x 10(13) W/cm(2) was explored in fully differential measurements.
Well below the field-modified recollision threshold we enter the
multiphoton regime. Strongly correlated back-to-back emission of
the electrons along the polarization direction is observed to dominate
in striking contrast to all previous data. No effect of Coulomb repulsion
can be found, the predicted cutoff in the sum-energy spectra of two
emitted electrons is confirmed, and the potential importance of multiple
recollisions is discussed.
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