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Unusual rotations in helium and hydrogen nanoclusters and ’nanoscopic’ superfluidity

,
Institute of Spectroscopy, Russian Academy of Sciences, ul. Fizicheskaya 5, Troitsk, Moscow, 108840, Russian Federation

This paper reviews research on helium clusters (of up to 20 atoms) and molecular hydrogen clusters (of up to 17 molecules) weakly bound by van der Waals forces to a light chromophore molecule such as OCS, N2O, CO2, or CO. Such clusters form in supersonic gas jets and are studied through the spectrum of the particular chromophore used. It is found that as the cluster grows, its rotational frequency increases (the effective moment of inertia decreases) starting from a certain number of atoms (molecules) attached. Also, in CO-based clusters a nearly free rotation of the chromophore molecule was observed. Experimental studies of such clusters are reviewed, as are those of the N2-CO and CO-CO complexes in which both monomers nearly freely rotate. The relation of these rotations to the superfluidity of helium and hydrogen is discussed, and comparisons are made with spectroscopic experiments on chromophores and hydrogen clusters in liquid helium nanodroplets.

Fulltext pdf (405 KB)
Fulltext is also available at DOI: 10.1070/PU2006v049n11ABEH006073
PACS: 05.30.Jp, 33.20.−t, 36.40.−c, 67.40.−w (all)
DOI: 10.1070/PU2006v049n11ABEH006073
URL: https://ufn.ru/en/articles/2006/11/a/
000245010300001
2-s2.0-33947711170
2006PhyU...49.1113D
Citation: Dumesh B S, Surin L A "Unusual rotations in helium and hydrogen nanoclusters and 'nanoscopic' superfluidity" Phys. Usp. 49 1113–1129 (2006)
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Оригинал: Думеш Б С, Сурин Л А «Необычные вращения в нанокластерах гелия и водорода и „наноскопическая“ сверхтекучесть» УФН 176 1137–1154 (2006); DOI: 10.3367/UFNr.0176.200611a.1137

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