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A coherent superposition of rotational states in D$_2$ has been excited bynonresonant ultrafast (12 femtosecond) intense (2 $\times$ 10$^{14}$Wcm$^{-2}$) 800 nm laser pulses leading to impulsive dynamic alignment.Field-free evolution of this rotational wavepacket has been mapped to hightemporal resolution by a time-delayed pulse, initiating rapid doubleionization, which is highly sensitive to the angle of orientation of themolecular axis with respect to the polarization direction, $\theta$. Thedetailed fractional revivals of the neutral D$_2$ wavepacket as a function of$\theta$ and evolution time have been observed and modelled theoretically.

Mapping the Evolution of Optically-Generated Rotational Wavepackets in a Room Temperature Ensemble of D$_2$