Наукова електронна бібліотека
періодичних видань НАН України
періодичних видань НАН України
On the formation mechanism of impurity-helium solids: evidence for extensive clustering
Репозиторій DSpace/Manakin
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On the formation mechanism of impurity-helium solids: evidence for extensive clustering
Тема:
3-й Международный семинар по физике низких температур в условиях микрогравитации
Інший ID:
PACS: 67.80.-s, 61.46.+w
Посилання:
On the formation mechanism of impurity-helium solids: evidence for extensive clustering / E.A. Popov, J. Eloranta, J. Ahokas, H. Kunttu // Физика низких температур. — 2003. — Т. 29, № 6. — С. 684-689. — Бібліогр.: 24 назв. — англ.
Підтримка:
We wish to thank David M. Lee and Vladimir Khmelenko for fruitful discussions on impurity helium solids. This work was supported by the Academy of Finland.
Дата:
2003
Переглядів:
933
Завантажень:
451
Анотація:
Optical emission studies on a discharged nitrogen-helium gas jet injected into superfluid helium near 1.5 K are described. The analysis of atomic (a-group) and molecular Vegard-Kaplan transitions clearly indicates that the emitting species are embedded in the nitrogen clusters. The formation of the clusters is most efficient in the crater formed on the liquid surface. The model calculations based on the classical bubble model and density functional theory suggest that under the experimental conditions only clusters consisting of more than 1000 molecules have a kinetic energy sufficient for the stable cavity formation inside liquid helium. The results obtained suggest that the formation of impurity-helium solids is a consequence of extensive clustering in the gas jet.
