Abstract
We have measured the temperature dependence of the time of flight of helium excimer molecules \(\mathrm {He}_{2}^{*}(a^{3}\Sigma ^{+}_{u})\) in superfluid 4He and find that the molecules behave ballistically below ∼100 mK 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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Acknowledgements
This work was supported through the Materials World Network program by the Engineering and Physical Sciences Research Council [Grant No. EP/H04762X/1] and the National Science Foundation [Grants DMR-1007937 and DMR-1007974]. PMW is indebted to EPSRC for the Career Acceleration Fellowship [Grant No. EP/I003738/1].
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Zmeev, D.E., Papkour, F., Walmsley, P.M. et al. Observation of Crossover from Ballistic to Diffusion Regime for Excimer Molecules in Superfluid 4He. J Low Temp Phys 171, 207–213 (2013). https://doi.org/10.1007/s10909-012-0720-6
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DOI: https://doi.org/10.1007/s10909-012-0720-6