On the free rotation of a molecule embedded in helium-4 clusters

TL;DR

This paper proposes a model explaining how superfluidity in helium-4 clusters influences the rotational constant's dependence on the number of atoms, linking microscopic superfluid behavior to observable rotational properties.

Contribution

The paper introduces a new model connecting superfluidity to the N-dependence of the rotational constant in helium-4 clusters, providing a theoretical framework for understanding experimental observations.

Findings

Model explains the N-dependence of rotational constant B

Links superfluidity to rotational behavior in helium clusters

Suggests simulation results will match experimental data

Abstract

The fact, that $^4$He atoms on different concentric circular paths around the axis of a quantum vortex move with identically equal angular momentum, which represents an important aspect of superfluidity of He-II, has been used to discover a model which can explain the {\it typical nature} of experimentally observed $N$ (number of $^4He$ atoms) dependence of the rotational constant ($B$) of the rotor part of a cluster M:He$_N$. It reveals how exactly superfluidity is related to the said dependence of $B$ on $N$. We believe that this model, when used with simulation techniques, would render results that would agree closely with experiments.