ArnHF (n = 1-4) van der Waals clusters: A quantum Monte Carlo study of ground state energies, structures and HF vibrational frequency shifts

Parhat Niyaz, Zlatko Bačić, Jules W. Moskowitz, Kevin Schmidt

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Rigid-body diffusion quantum Monte Carlo (DQMC) calculations of the intermolecular vibrational ground states of ArnHF clusters with n = 1-4, for HF v = 0 and v = I, are reported. The intermolecular degrees of freedom of the clusters are treated in full dimensionality, and the best available pairwise additive potential surfaces are used. The calculations yield intermolecular ground state energies, probability distributions of intermolecular coordinates and HF vibrational red-shifts. The vibrationally averaged cluster structures are consistent with experimental geometries. Small but systematic differences between the pairwise additive DQMC red-shifts and experimental values for the n = 2-4 clusters are indicative of the need for the inclusion of nonadditive interactions.

Original languageEnglish (US)
Pages (from-to)23-32
Number of pages10
JournalChemical Physics Letters
Issue number1-2
StatePublished - Apr 5 1996


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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