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Accurate computer simulations of the rotational dynamics of linear moleculessolvated in He clusters indicate that the large-size (nano-droplet) regime isattained quickly for light rotors (HCN, CO) and slowly for heavy ones (OCS,N$_2$O, CO$_2$), thus challenging previously reported results. Those resultsspurred the view that the different behavior of light rotors with respect toheavy ones - including a smaller reduction of inertia upon solvation of theformer - would result from the lack of adiabatic following of the He densityupon molecular rotation. We have performed computer experiments in which therotational dynamics of OCS and HCN molecules was simulated using a fictitiousinertia appropriate to the other molecule. These experiments indicate that theapproach to the nano-droplet regime, as well as the reduction of the molecularinertia upon solvation, is determined by the anistropy of the potential, morethan by the molecular weight. Our findings are in agreement with recentinfrared and/or microwave experimental data which, however, are not yet totallyconclusive by themselves.Comment: 11 pages, 13 figure

Computational spectroscopy of helium-solvated molecules: Effective inertia, from small He clusters toward the nanodroplet regime