Monte Carlo simulations of small water clusters: Microcanonical vs canonical ensemble

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The meaning of the microcanonical and canonical ensembles is discussed in connection with the study of physical properties of small systems. Parallel tempering Monte Carlo is then applied to study the (H2O)8 clusters. The results show that the ensembles give similar average structural properties, but the canonical energy fluctuations are much larger than their microcanonical counterpart. These larger fluctuations are analyzed in terms of the thermal bath implicitly present in the canonical simulations.

Original languageEnglish
Pages (from-to)291-297
Number of pages7
JournalChemical Physics Letters
Issue number3-4
Publication statusPublished - 30 Jul 2002
Externally publishedYes


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

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