Journal of Low Temperature Physics

, Volume 171, Issue 3–4, pp 207–213 | Cite as

Observation of Crossover from Ballistic to Diffusion Regime for Excimer Molecules in Superfluid 4He

  • 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
Article

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.

Keywords

Excimer molecules Diffusion Superfluid 4He 

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • D. E. Zmeev
    • 1
    • 2
  • F. Papkour
    • 1
  • P. M. Walmsley
    • 1
  • A. I. Golov
    • 1
  • P. V. E. McClintock
    • 2
  • S. N. Fisher
    • 2
  • W. Guo
    • 3
  • D. N. McKinsey
    • 3
  • G. G. Ihas
    • 4
  • W. F. Vinen
    • 5
  1. 1.School of Physics and AstronomyUniversity of ManchesterManchesterUK
  2. 2.Department of PhysicsLancaster UniversityLancasterUK
  3. 3.Department of PhysicsYale UniversityNew HavenUSA
  4. 4.Department of PhysicsUniversity of FloridaGainesvilleUSA
  5. 5.School of Physics and AstronomyUniversity of BirminghamBirminghamUK

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