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

C. Callegari·A. Conjusteau·I. Reinhard·K. K. Lehmann·G. Scoles·F. Dalfovo
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Abstract

We present a superfluid hydrodynamic model for the increase in moment of inertia, $ΔI$, 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 $ΔI$ 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 $ΔI$. This is likely to result from a (partial) breakdown of the adiabatic following approximation.

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C. Callegari, A. Conjusteau, I. Reinhard, K. K. Lehmann, G. Scoles, F. Dalfovo. 1999-12-15. A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4He. https://doi.org/10.1103/physrevlett.83.5058

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