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Assemblies of highly excited Rydberg atoms in an ultracold gas can be setinto motion by a combination of van-der-Waals and resonant dipole-dipoleinteractions. Thereby, the collective electronic Rydberg state might change dueto non-adiabatic transitions, in particular if the configuration encounters aconical interaction. For the experimentally most accessible scenario, in whichthe Rydberg atoms are initially randomly excited in a three-dimensional bulkgas under blockade conditions, we numerically show that non-adiabatictransitions can be common when starting from the most energetic repulsiveBO-surface. We outline how this state can be selectively excited using amicrowave resonance, and demonstrate a regime where almost all collisionalionization of Rydberg atoms can be traced back to a prior non-adiabatictransition. Since Rydberg ionisation is relatively straightforward to detect,the excitation and measurement scheme considered here renders non-adiabaticeffects in Rydberg motion easier to demonstrate experimentally than inscenarios considered previously.

Non-adiabatic dynamics in Rydberg gases with random atom positions