Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 11, Issue 6, Pages 921-925Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b810837d
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We have performed relativistic effective core potential calculations with and without spin-orbit coupling term in the framework of the density functional theory and investigated the geometry and binding energy of different isomers of free platinum clusters Pt-n (n = 4-6) for the spin multiplicities from singlet to nonet. The spin-orbit coupling effect has been discussed for the minimum-energy structures, relative stabilities, vibrational frequencies, magnetic moments, and the highest occupied and lowest unoccupied molecular-orbital gaps. It is found in contrast to some of the previous calculations that 3-D configurations are still lowest energy structures of these clusters, although spin-orbit effect makes some planar or quasi-planar geometries more stable than some other 3-D isomers. Spin-orbit coupling effects change the relative stability of various isomers.
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