Abstract
We trace vibrational wavepacket motion in two-dimensional electronic spectra of a two-level electronic system. The vibronic evolution induces a periodic beating pattern of the diagonal-to-antidiagonal peak width ratio in the absorptive signal part and a periodic tilt of the nodal line in the dispersive signal part. These modulations can be assigned to periodic modulations of the relative amplitudes of rephasing and non-rephasing contributions to the signal.
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