Thermodynamics of atomic clusters using variational quantum hydrodynamics |
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Authors: | Derrickson Sean W Bittner Eric R |
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Affiliation: | Department of Chemistry and Center for Materials Chemistry, University of Houston, Houston, Texas 77204, USA. |
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Abstract: | Small clusters of rare-gas atoms are ideal test cases for studying how quantum delocalization affects both the thermodynamics and the structure of molecular scale systems. In this paper, we use a variational quantum hydrodynamic approach to examine the structure and dynamics of (Ne)n clusters, with n up to 100 atoms, at both T = 0 K and for temperatures spanning the solid-to-liquid transition in bulk Ne. Finite temperature contributions are introduced to the grand potential in the form of an "entropy" potential. One surprising result is the prediction of a negative heat capacity for very small clusters that we attribute to the nonadditive nature of the total free-energy for very small systems. |
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