Rotationally induced luminescence of nanoclusters immersed in superfluid helium
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 (²D→⁴S transition) in nanoclusters which correlated with...
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| Datum: | 2019 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2019
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| Schriftenreihe: | Физика низких температур |
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| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/175950 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Rotationally induced luminescence of nanoclusters immersed in superfluid helium / P.T. McColgan, S. Sheludiakov, P.M. Rentzepis, D.M. Lee, V.V. Khmelenko // Физика низких температур. — 2019. — Т. 45, № 3. — С. 356-362. — Бібліогр.: 32 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | 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 (²D→⁴S 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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