Concerted Diffusion of Molecular Clusters in a Molecular Sieve

David S. Sholl, Kristen S. Fichthorn

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Abstract

We show that attractive interactions between molecules adsorbed in molecular sieves play a vital role in the mechanisms and rates of intracrystalline diffusion. Over a wide temperature range, the single-file diffusion of CF4, SF6, and CCl4 in AlPO4- 5 is dominated by the diffusion of molecular clusters. SF6 and CCl4 clusters diffuse by concerted mechanisms involving all of the cluster’s molecules simultaneously. The activation energies, Ea, for these mechanisms are strongly size dependent and are lower than Ea for monomer diffusion.

Original languageEnglish (US)
Pages (from-to)3569-3572
Number of pages4
JournalPhysical Review Letters
Volume79
Issue number19
DOIs
StatePublished - Jan 1 1997

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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