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Onset of superfluidity in small CO2(4He)N clusters
F Paesani1, Y Kwon, K B Whaley
1Department of Chemistry and Pitzer Center for Theoretical Chemistry, University of California, Berkeley, California 94720, USA.
Physical Review Letters
|May 21, 2005
Summary
Superfluidity emerges in small helium clusters doped with CO2 molecules. This anisotropic response, observed for N>=5, explains the molecule
Area of Science:
- Quantum fluid dynamics
- Low-temperature physics
- Molecular spectroscopy
Background:
- Helium clusters exhibit unique quantum properties.
- Understanding molecular behavior in helium environments is crucial.
- Superfluidity in finite systems presents theoretical challenges.
Purpose of the Study:
- To provide theoretical evidence for superfluidity in small helium clusters doped with molecules.
- To quantitatively analyze the spectroscopic constants of CO2 in (4)He(N).
- To investigate the relationship between superfluid response and molecular spectra.
Main Methods:
- Path integral calculations.
- Analysis of nonclassical rotational inertia.
- Spectroscopic constant determination for CO2 in (4)He(N).
Main Results:
- Definitive theoretical evidence for superfluidity onset at N>=5.
- Significant superfluid response observed, anisotropic in nature.
- Unit response to rotation around the CO2 axis for N>=5.
- Partial response to perpendicular rotations for N>=6.
Conclusions:
- Anisotropic superfluid response in (4)He(N) clusters dictates molecular spectral behavior.
- The findings elucidate the onset and characteristics of superfluidity in finite quantum systems.
- This study links microscopic quantum phenomena to observable spectroscopic properties.