Volume 83, Number 6, September 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||12 September 2008|
Infrared Q-branch anomalies on cooling small OCS (pH2)n clusters from 0.38 K to 0.15 K
Max-Planck-Institut für Dynamik und Selbstorganisation - Bunsenstraße 10, 37073 Göttingen, Germany, EU
Accepted: 25 July 2008
Infrared spectra of OCS molecules with 8≤ n ≤ 16 attached para-hydrogen (pH2) molecules inside pure 4He droplets at 0.38 K and in mixed 4He/3He droplets at 0.15 K are compared with the same-sized oD2 clusters. In the pH2 clusters the Q-branch is observed at 0.38 K, except for , but disappears for n ≥ 11 on cooling to 0.15 K, whereas it is present in all the oD2 clusters. The high axial symmetry of the pH2 clusters at 0.15 K is consistent with the onset of microscopic superfluidity resulting predominantly from exchanges accompanying the hindered rotations of two or more rings.
PACS: 67.90.+z – Other topics in quantum fluids and solids / 36.40.Mr – Spectroscopy and geometrical structure of clusters / 33.20.Ea – Infrared spectra
© EPLA, 2008
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