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We have measured the temperature dependence of the time of flight of heliumexcimer molecules He2* in superfluid 4He and find that the molecules behaveballistically below 100mK and exhibit Brownian motion above 200 mK. In theintermediate temperature range the transport cannot be described by either ofthe models.

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