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Abstract:
We have investigated multiple ionization of N2 and O2 molecules by 52 nm extreme-ultraviolet light
pulses at the free-electron laser facility SCSS in Japan. Coulomb break-up of parent ions with
charge states up to 5+ is found by the ion-ion coincidence technique. The charge-state dependence
of kinetic energy release distributions suggests that the electrons are emitted sequentially in
competition with the elongation of the bond length.