Observation of Crossover from Ballistic to Diffusion Regime for Excimer Molecules in Superfluid $^4$He
D.E. Zmeev, F. Papkour, P.M. Walmsley, A.I. Golov, P.V.E. McClintock,, S.N. Fisher, W. Guo, D.N. McKinsey, G.G. Ihas, W.F. Vinen
TL;DR
This study investigates how helium excimer molecules transition from ballistic to diffusive motion in superfluid helium as temperature increases, revealing a crossover in their transport behavior.
Contribution
It provides the first detailed measurement of the temperature-dependent transport regime crossover for helium excimers in superfluid helium.
Findings
Ballistic behavior below 100 mK
Brownian motion above 200 mK
Intermediate regime not described by simple models
Abstract
We have measured the temperature dependence of the time of flight of helium excimer molecules He2* in superfluid 4He and find that the molecules behave ballistically below 100mK and exhibit Brownian motion above 200 mK. In the intermediate temperature range the transport cannot be described by either of the models.
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