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Study on structures and electron affinities of small potassium–silicon clusters Si n K (n = 2–8) and their anions with Gaussian-3 theory

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Abstract

The neutral Si n K (n = 2–8) clusters and their anions have been systematically studied by means of the higher level of Gaussian-3 schemes. Equilibrium geometries and electron affinities have been calculated and are discussed for each considered size. For neutral Si n K clusters, the ground state structure is found to be “attaching structure”, in which the K atom is bound to Si n clusters. The most stable isomer for their anions, however, is found to be “substitutional structures”, which is derived from Si(n+1) by replacing the Si atom with a K. The dissociation energies of K atom from the lowest energy structures of Si n K have also been estimated to examine relative stabilities.

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Notes

  1. The ground state structure are isosceles triangle for Si3, rhombus for Si4, trigonal bipyramid for Si5, tetragonal bipyramid for Si6, pentagonal bipyramid for Si7, distorted bicapped octahedron for Si8 and bicapped pentagonal bipyramid for Si9. Also see Refs. [7, 3032].

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Acknowledgments

This work has been financially supported by a research grant (Grant No. NJ05052) administered by the Science and Research Foundation of Higher Education of Inner Mongolia and by the NCET Grant (Grant No. NCET-06-0267) from the Ministry of Education of the People’s Republic of China.

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Correspondence to Ju-Cai Yang.

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Hao, DS., Liu, JR., Wu, WG. et al. Study on structures and electron affinities of small potassium–silicon clusters Si n K (n = 2–8) and their anions with Gaussian-3 theory. Theor Chem Acc 124, 431–437 (2009). https://doi.org/10.1007/s00214-009-0635-8

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