Abstract
We observed the temporal evolution of an attosecond electron wavepacket in a nitrogen molecule with
an intense a-few-pulse attosecond pulse train. Such an intense a-few-pulse attosecond pulse train
generated from a sub-15-fs laser system enables us to conduct attosecond-pump and attosecond-probe
measurements of electron wavepackets formed among more than five bound electronic states. We
recorded the momentum images of the nitrogen atomic ions generated from the dissociation processes in
singly-charged manifolds as a function of the delay between the pump and probe pulses. The electronic
states involved in the formation of electron wavepackets were identified by recording the temporal
evolution of vibrational wavepackets.
