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In a two-color femtosecond pump-probe experiment photoelectron spectra were detected to map the nuclear wave packet in the 2 1 Σ u+ Na 2 double-minimum state. The wave packet serves as a local probe for the R-dependent ionization probability. The pump photon energy of 3.65 eV allows to access a range of internuclear distances from 3 to 9 A. The bound 1 2 Σ ...
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