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Observation of crossover from ballistic to diffusion regime for excimer molecules in superfluid 4He

Research output: Contribution to journalJournal article


Journal publication date05/2013
JournalJournal of Low Temperature Physics
Number of pages7
Early online date14/09/12
Original languageEnglish


We have measured the temperature dependence of the time of flight of helium excimer molecules He2 (a3 Σ + 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.