The rotational dynamics of CO single molecules solvated in small He clusters has been studied using reptation quantum Monte Carlo simulations for cluster sizes up to Our results are in good agreement with the rotovibrational features of the infrared spectrum recently determined for this system and provide a deep insight into the relation between the structure of the cluster and its dynamics. Simulations for large N also provide a prediction of the effective moment of inertia of CO in the He nanodroplet regime, which has not been measured so far.
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