We present an experimental study of the thermodynamics of free, size-selected water cluster anions consisting of 48 and 118 molecules. The measured caloric curves of the clusters are bulklike at low temperatures but show a well-defined, particle-size specific transition at 93±3 K for (H₂O)₄₈^- and 118±3 K for (H₂O)₁₁₈^-. At the transition temperature the heat capacity strongly increases, which marks the onset of melting.
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Hock et al. (2009) studied this question.
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