Time-resolved photoelectron spectroscopy in combination with femtosecond pump-probe and molecular beam techniques is used to map the vibrational wavepacket motion along the internuclear coordinate. Using an attenuated femtosecond pump pulse and a probe pulse with variable intensity, the influence of high laser fields on the molecular potential is detected sensitive to the internuclear distance. We observe electronic transitions at non-Franck-Condon allowed areas which are attributed to light-induced potentials.