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Small sodium clusters that melt gradually: Melting mechanisms in Na30

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FIG. 1. 共Color online兲 Orbital-free GS isomer of Na 30 . Golden 共light兲 and blue 共dark兲 spheres differentiate atoms in core and  sur-face regions, respectively
FIG. 2. 共Color online兲 共a兲 Caloric curve 共upper left兲, specific heat 共lower left兲, rms bond-length-fluctuation parameter ␦ 共upper right兲, and mean-square displacements 共lower right兲 of Na 30 as a function of increasing temperature
Figure 3共a兲 shows another surprising feature. At a tem- tem-perature as low as 30 K, the cluster has enough energy for permutational isomerizations
FIG. 6. 共Color online兲 Pictorial representation of the isomeriza- isomeriza-tion process identified in the run at 40 K
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