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Updated: Jul 11, 2026
10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Melting transitions in isotropically confined three-dimensional small Coulomb clusters
S W S Apolinario1, F M Peeters
1Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium. sergio.apolinario@ua.ac.be
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 13, 2007
Summary
Molecular dynamic simulations reveal that magic clusters, with specific symmetries, exhibit enhanced stability. These clusters undergo intershell melting before intrashell and radial melting, offering insights into phase transitions.
Area of Science:
- Computational physics
- Materials science
- Statistical mechanics
Background:
- Understanding phase transitions in confined systems is crucial.
- Charged particle clusters in potentials exhibit unique behaviors.
- Melting processes in finite systems differ from bulk materials.
Purpose of the Study:
- Investigate the melting process of small 3D charged particle clusters.
- Identify stable configurations and melting pathways.
- Analyze the influence of interparticle interactions and screening on melting.
Main Methods:
- Molecular dynamic simulations of classical charged particles.
- Utilized isotropic parabolic potential for confinement.
- Applied Lindemann's criterion and normal mode analysis.
Main Results:
- Identified magic clusters (N=6, 12, 13, 38) with octahedral/icosahedral symmetry.
- Observed intershell melting preceding intrashell/radial melting in stable clusters.
- Found local radial melting and symmetry increase in two-shell systems.
Conclusions:
- Magic clusters demonstrate significant stability against diffusion.
- Melting pathways are dependent on cluster size, symmetry, and interparticle interactions.
- Normal modes play a critical role in initiating the melting process.
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