Münster 1999 – scientific programme

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TT: Tiefe Temperaturen

TT 21: Postersitzung III: Hochfrequenzeigenschaften (1-4), Amorphe Systeme (5-9), Borkarbide (10-18), Quantenflüssigkeiten (19-25), Dünne Filme (26-49), Vortexdynamik, Pinning (50-63), M-I-Überg
änge, quantenkritische Ph
änomene (64-89)

TT 21.22: Poster

Thursday, March 25, 1999, 14:30–18:00, Foy

Superfluidity of small 4He clusters and free rotation of the embedded molecule — •Slava Grebenev — MPISF 37073 Gottingen Bunsenstrasse 10

The infrared spectrum of single OCS molecule was measured inside large pure hellium-4 droplets and nonsuperfluid pure helium-3 droplets, both consisting of about 10000 atoms. In the helium-4 droplets sharp rotational lines were observed, whereas in helium-3 only a broad peak was found. This difference is interpreted as evidence that the narrow rotational lines, which imply free rotations,are a microscopic manifestation of superfluidity. Upon addition of 60 helium-4 atoms to the pure helium droplets, the same sharp rotational lines were found; it appears that 60 is the minmum number needed for superfluidity. The dependence of the molecular moment of inertia on the number of helium-4 atoms in the helium-3 droplet is reported.