Quantum vortices and thermally induced luminescence of nitrogen nanoclusters immersed in liquid helium

Meraki, Adil; McColgan, P. T.; Rentzepis, P. M.; Li, Runze; Lee, D. M.; Khmelenko, V. V.

doi:10.1103/physrevb.95.104502

Cited by 5 publications

(2 citation statements)

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“…atoms stored on the surfaces of the nanoclusters [15]. The luminescence of ensembles of nanoclusters immersed in He II was found to be correlated with the vortex density in bulk He II.…”

Section: Discussionmentioning

confidence: 92%

“…The technique of nanowire formation by ablating metallic nanoparticles from a target in He II was realized on the basis of coalescence of the nanoparticles in the vortex cores [13,14]. The luminescence of ensembles of molecular nitrogen nanoclusters containing stabilized nitrogen atoms was initiated in He II by quantum vortices [15]. In this latter case the dependence of luminescence intensity on temperature was correlated with that of the vortex density in the temperature range 1.2-2.1 K. These nanoclusters are created by the injection of nitrogen-helium gas mixtures into bulk He II after passing through a radio-frequency discharge zone [16].…”

Section: Introductionmentioning

confidence: 99%

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Rotationally induced luminescence of nanoclusters immersed in superfluid helium

McColgan

Sheludiakov

Rentzepis

et al. 2019

Low Temperature Physics

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We studied the influence of rotation speed of a beaker containing superfluid helium (He II) on the intensity of luminescence of collections of nanoclusters immersed in He II. We observed an increase in the α-group emission of nitrogen atoms ( 2 D→ 4 S transition) in nanoclusters which correlated with the increasing of rotational speed of the beaker. Increasing luminescence was also observed by increasing the concentration of molecular nitrogen in the nitrogen-helium gas mixtures used for the formation of the molecular nitrogen nanoclusters. We suggest that this effect is caused by the change of the density of quantum vortices in He II initiated by variation of rotational speed of the beaker. When the density of the vortices is increased, the probability for the nanoclusters to become trapped in the vortex cores is also increased. The collisions in the vortex cores of trapped nanoclusters with nitrogen atoms stabilized mostly on the surfaces of the nanoclusters initiate the recombination of nitrogen atoms resulting in luminescence.

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“…atoms stored on the surfaces of the nanoclusters [15]. The luminescence of ensembles of nanoclusters immersed in He II was found to be correlated with the vortex density in bulk He II.…”

Section: Discussionmentioning

confidence: 92%