A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4He
Abstract
We present a superfluid hydrodynamic model for the increase in moment of inertia, I, of molecules rotating in liquid 4He. The static inhomogeneous He density around each molecule (calculated using the Orsay-Paris liquid 4He density functional) is assumed to adiabatically follow the rotation of the molecule. We find that the 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 HCCCH3 ]. For HCN and HCCH, our model substantially overestimates I. This is likely to result from a (partial) breakdown of the adiabatic following approximation.
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