Abstract
We investigated the coherent motion of vibrational wave packets in the |B〉 1Πu state of the potassium dimer applying two color pump/probe spectroscopy with a sub 100 fs time resolution. Special interest was paid to the ionization probe step which was analyzed carefully by varying the probe energy over a wide range. Time-dependent quantum calculations explain the experimental outcomes by introducing a nonconstant transition dipole moment between the |B〉 and the ionic state |X+〉 and by taking into account the excitation of long lived autoionizing Rydberg states.
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