Ionization potentials of cobalt–sodium bimetallic clusters (Co<i>n</i>Na<i>m</i>)

Hoshino, Kuniyoshi; Naganuma, Takashi; Yamada, Y.; Watanabe, Katsura; Nakajima, Atsushi; Kaya, Kunimitsu

doi:10.1063/1.462961

Cited by 18 publications

(8 citation statements)

References 22 publications

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“…A dual-target dual-laser vaporization source [14][15][16] was used to prepare the Pd-Au bimetallic and pure Au nanoclusters. The nanoclusters were deposited 17,18 on TEM grids, which consist of amorphous carbon layers on a lacy polymer film supported by a Cu grid.…”

Section: Methodsmentioning

confidence: 99%

Compositional changes of Pd-Au bimetallic nanoclusters upon hydrogenation

et al. 2009

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Changes in the size distribution and composition of bimetallic Pd-Au nanoclusters have been observed after hydrogen exposure. This effect is caused by hydrogen-induced Ostwald ripening whereby the hydrogen reduces the binding energy of the cluster atoms leading to their detachment from the cluster. The composition changes due to a difference in mobility of the detached palladium and gold atoms on the surface. Fast palladium atoms contribute to the formation of larger nanoclusters, while the slower gold atoms are confined to the smaller nanoclusters. These transformations in the Pd-Au nanocluster size and composition set a limit for chemical reactions in which such nanoclusters are involved together with hydrogen.

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Section: Methodsmentioning

confidence: 99%

Compositional changes of Pd-Au bimetallic nanoclusters upon hydrogenation

et al. 2009

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“…However, the reaction mechanism cannot be applied to the reaction of bimetallic clusters, such as Co n Al m 45 and Co n Na m . 46 In the latter cases, the addition of another element to pure clusters induces a geometric and/or electronic rearrangement. Because the charge transfer mechanism can be successfully applied to the reaction of Si n Na m , it also suggests the rigidity of the Si n framework.…”

Section: A Ionization Energy and Reactivity Of Si N Na M Clustersmentioning

confidence: 99%

Geometric and electronic structures of silicon–sodium binary clusters. I. Ionization energy of SinNam

Kishi

Iwata

Nakajima

et al. 1997

The Journal of Chemical Physics

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Structural and electronic properties of Ge n m− and KGe n − Zintl anions (n=3-10;m=2-4) from density functional theory Geometric and electronic structures of silicon-sodium binary clusters. II. Photoelectron spectroscopy of Si n Na m − cluster anions Sodium doped silicon clusters ͑Si n Na m ; 1рnр14, 1рmр5͒ produced by two types of laser vaporization were studied. The adsorption of Na atoms on the Si n clusters leads the substantial lowering of the ionization energy, E i , of Si n Na m clusters. Their reactivity toward NO molecules was measured with a fast flow reactor, and the anticorrelation between the E i s and the reactivity was clearly observed; species having low E i exhibit high reactivity and vice versa. Moreover, the clear parallelism between the E i s of Si n Na and the EAs of Si n is found. This is consistent with the fact that the structure of Si n Na clusters keeps the frame of the corresponding Si n cluster unchanged and that the electronic structure of Si n Na is similar to that of the corresponding negative ion Si n Ϫ . In addition to the experimental studies, the geometries, adsorption energies, and vertical ionization energies of Si n Na (nϭ1 -7) were investigated with ab initio MO calculations including electron correlation; The Mo "ller-Plesset perturbation theory was used and the configuration interaction ͑CI͒ calculation was carried out, particularly for a diatomic molecule, SiNa.

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“…While Knight and co-workers 7,8 reported the existence of electronic shells in potassium clusters doped with a sodium atom, Kappes et al 9 found severe deviations from the shell model if Li, Mg, and Zn were the dopant atoms. Since then, several experimental groups have adressed the question of presence or absence of electronic shells in bimetallic clusters by determining stability, ionization potentials and/or reactivity, [10][11][12][13][14][15][16][17][18][19][20] and their results have been compared to a number of theoretical studies [21][22][23][24][25][26] concerning the same issue.…”

Section: Introductionmentioning

confidence: 99%