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Molecules show a much increased multiple ionization rate in a strong laserfield as compared to atoms of similar ionization energy. A widely acceptedmodel attributes this to the action of the joint fields of the adjacent ioniccore and the laser on its neighbor inside the same molecule. The underlyingphysical picture for the enhanced ionization is that the up-field atom thatgets ionized. However, this is still debated and remains unproven. Here wereport an experimental verification of this long-standing prediction. This isaccomplished by probing the two-site double ionization of ArXe, where theinstantaneous field direction at the moment of electron release and theemission direction of the correlated ionizing center are measured by detectingthe recoil sum- and relative-momenta of the fragment ions. Our resultsunambiguously prove the intuitive picture of the enhanced multielectrondissociative ionization of molecules and clarify a long-standing controversy.

Probing the tunneling site of electrons in strong field enhanced ionization of molecules