Reactivity of positively charged cobalt cluster ions with CH4, N2, H2, C2H4, and C2H2

Atsushi Nakajima, T. Kishi, Y. Sone, S. Nonose, K. Kaya

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Reactivity of positively charged cobalt cluster ions (Con+, n=2-22), produce by laser vaporization, with various gas samples (CH4, N2, H2, C2H4, and C2H2) were systematically investigated by using a fast-flow reactor. The reactivity of Con+ with the various gas samples is qualitatively consistent with the adsorption rate of the gas to cobalt metal surfaces. Con+ highly reacts with C2H2 as characterized by the adsorption rate to metal surfaces, and it indicates no size dependence. In contrast, the reactions of Con+ with the other gas samples indicate a similar cluster size dependence; at n=4, 5, and 10-15, Con+ highly reacts. The difference can be explained by the amount of the activation energy for chemisorption reaction. Compared with neutral cobalt clusters, the size dependence is almost similar except for Co4+ and Co5+. The reactivity enhancement of Co4+ and Co5+ indicates that the cobalt cluster ions are presumed to have an active site for chemisorption at n=4 and 5, induced by the influence of positive charge.

Original languageEnglish
Pages (from-to)385-387
Number of pages3
JournalZeitschrift für Physik D Atoms, Molecules and Clusters
Volume19
Issue number4
DOIs
Publication statusPublished - 1991 Mar

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cobalt
reactivity
gases
chemisorption
metal surfaces
ions
adsorption
reactors
activation energy
augmentation
lasers

Keywords

  • 34.50.Lf
  • 36.40.+d

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Reactivity of positively charged cobalt cluster ions with CH4, N2, H2, C2H4, and C2H2. / Nakajima, Atsushi; Kishi, T.; Sone, Y.; Nonose, S.; Kaya, K.

In: Zeitschrift für Physik D Atoms, Molecules and Clusters, Vol. 19, No. 4, 03.1991, p. 385-387.

Research output: Contribution to journalArticle

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AU - Nonose, S.

AU - Kaya, K.

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N2 - Reactivity of positively charged cobalt cluster ions (Con+, n=2-22), produce by laser vaporization, with various gas samples (CH4, N2, H2, C2H4, and C2H2) were systematically investigated by using a fast-flow reactor. The reactivity of Con+ with the various gas samples is qualitatively consistent with the adsorption rate of the gas to cobalt metal surfaces. Con+ highly reacts with C2H2 as characterized by the adsorption rate to metal surfaces, and it indicates no size dependence. In contrast, the reactions of Con+ with the other gas samples indicate a similar cluster size dependence; at n=4, 5, and 10-15, Con+ highly reacts. The difference can be explained by the amount of the activation energy for chemisorption reaction. Compared with neutral cobalt clusters, the size dependence is almost similar except for Co4+ and Co5+. The reactivity enhancement of Co4+ and Co5+ indicates that the cobalt cluster ions are presumed to have an active site for chemisorption at n=4 and 5, induced by the influence of positive charge.

AB - Reactivity of positively charged cobalt cluster ions (Con+, n=2-22), produce by laser vaporization, with various gas samples (CH4, N2, H2, C2H4, and C2H2) were systematically investigated by using a fast-flow reactor. The reactivity of Con+ with the various gas samples is qualitatively consistent with the adsorption rate of the gas to cobalt metal surfaces. Con+ highly reacts with C2H2 as characterized by the adsorption rate to metal surfaces, and it indicates no size dependence. In contrast, the reactions of Con+ with the other gas samples indicate a similar cluster size dependence; at n=4, 5, and 10-15, Con+ highly reacts. The difference can be explained by the amount of the activation energy for chemisorption reaction. Compared with neutral cobalt clusters, the size dependence is almost similar except for Co4+ and Co5+. The reactivity enhancement of Co4+ and Co5+ indicates that the cobalt cluster ions are presumed to have an active site for chemisorption at n=4 and 5, induced by the influence of positive charge.

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