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| Two-color APAPS. The generation of Ar+, as initiated by a broadband attosecond pump pulse with a photon energy around 20 eV, is probed by a second pulse with a central photon energy of 33.5 eV. This is above the second ionization potential of Ar, thereby producing Ar2+. The increase of the Ar2+ ion yield around zero delay is explained by the more efficient generation of Ar2+ when the probe pulse follows the pump pulse. The inset shows a fit of the attosecond pulse structure. |
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