G. G. Ihas | Searcharxiv

arXiv2013

Excimers He2* as Tracers of Quantum Turbulence in 4He in the T=0 Limit

We have studied the interaction of metastable $^4$He$_2^*$ excimer molecules with quantized vortices in superfluid $^4$He in the zero temperature limit. The vortices were generated by either rotation or ion injection. The trapping diameter of the molecules on quantized vortices was found to be $96\pm6$\,nm at a pressure of 0.1\,bar and $27\pm5$\,nm at 5.0 bar. We have also demonstrated that a moving tangle of vortices can carry the molecules through the superfluid helium.

cond-mat.other↗

arXiv2012

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

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.

cond-mat.other↗