A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4He

Details A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4He A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4He

1999-10-21

arxiv.org/abs/cond-mat/9910329v3

Physical Review Letters {\bf 88}, 5058-5061 (1999)

Physics

Condensed Matter

4 pages, 1 eps figure, corrected version of published paper. Erratum has been submitted for changes

Scientific paper

10.1103/PhysRevLett.83.5058

We present a superfluid hydrodynamic model for the increase in moment of inertia, $\Delta I$, of molecules rotating in liquid $^4$He. The static inhomogeneous He density around each molecule (calculated using the Orsay-Paris liquid $^4$He density functional) is assumed to adiabatically follow the rotation of the molecule. We find that the $\Delta I$ values created by the viscousless and irrotational flow are in good agreement with the observed increases for several molecules [ OCS, (HCN)$_2$, HCCCN, and HCCCH$_3$ ]. For HCN and HCCH, our model substantially overestimates $\Delta I$. This is likely to result from a (partial) breakdown of the adiabatic following approximation.

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