  Trilobite molecules are ultralong-range Rydberg molecules formed when a high
angular momentum Rydberg electron scatters off of a ground-state atom. Their
unique electronic structure and highly oscillatory potential energy curves
support a rich variety of dynamical effects yet to be explored. We analyze the
vibrational motion of these molecules using a framework of adiabatic wavepacket
propagation dynamics and observe that for appropriate initial states, the
trilobite potential acts as molecular diffraction grating. The quantum dynamic
effects observed are explained using a Fourier analysis of the scattering
potential and the associated scattered wavepacket. Furthermore, vibrational
ground-states of the low angular momentum ultralong-range Rydberg molecules are
found to be particularly suitable to prepare the relevant wavepackets. Hence,
we propose a time resolved pump-probe scheme designed for the realization of
the effect in question, and advertise the utilization of a single diatomic
Rydberg molecule as a testbed for the study of exaggerated quantum dynamical
phenomena.
