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Size effects in the solid phase transition of SF clusters

Zeitschrift für Physik D Atoms, Molecules and Clusters, ISSN: 0178-7683, Vol: 20, Issue: 1, Page: 251-253
1991
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Metrics Details

  • Citations
    13
    • Citation Indexes
      13
  • Captures
    1

Article Description

The structure of SF clusters produced in a free jet expansion is studied by electron diffraction methods. A solid phase transition is known to occur when clusters are warmed up by changing several experimental conditions in the expansion of a Ne + SF mixture. In the present study, the total stagnation pressure and the SF mole fraction are varied in order to understand how these parameters influence the structural state of the clusters and further to observe the phase transition for different cluster sizes. When the stagnation pressure p is larger than about 10 bar, a given mole fraction results in clusters with identical structure and probably identical temperature. When p is decreased below 10 bar, identical structures are found for lower and lower mole fractions. This structural behaviour suggests that for small clusters, containing less than about 500 molecules, the transition steps occur at temperatures lower than those observed for larger clusters. The possibility of detecting a temperature variation in the diffraction patterns of small cubic clusters is discussed. © 1991 Springer-Verlag.

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