Abstract
We show unequivocal evidence for formation of excimers in liquid He II created by ionizing radiation produced through neutron capture. Laser beams induce fluorescence of the excimers. The fluorescence is recorded at a rate of 55.6 Hz by a camera. The location of the fluorescence is determined with an uncertainty of . The technique provides an opportunity to record the flow of excimers in a medium with very small viscosity and enables measurement of turbulence around macroscopic liter size objects or vortex matter in three dimensions.
- Received 15 October 2019
- Accepted 15 December 2019
DOI:https://doi.org/10.1103/PhysRevLett.124.134502
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