Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters

M. R. Zakin; D. M. Cox; R. L. Whetten; D. J. Trevor; A. Kaldor

doi:10.1016/0009-2614(87)85146-1

Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters

M. R. Zakin, D. M. Cox, R. L. Whetten, D. J. Trevor, A. Kaldor

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Abstract

Large increases in the photoionization threshold energies of small V_x, NB_x, and Fe_x clusters (x = 3-25) induced by chemisorption of H₂ have been observed using photoionization time-of-flight mass spectrometry of a molecular beam. These shifts exhibit a definite dependence both on the number of atoms constituting the bare metal cluster and on the number of chemisorbed hydrogens, and are particularly large (≳ 0.8 eV) for multiple-H₂ chemisorption on small clusters. A simple frontier orbital model for the chemisorption process predicts the direction of adsorbate-induced shifts in cluster ionization threshold for both H₂ and NH₃ as adsorbates.

Original language	English (US)
Pages (from-to)	223-228
Number of pages	6
Journal	Chemical Physics Letters
Volume	135
Issue number	3
DOIs	https://doi.org/10.1016/0009-2614(87)85146-1
State	Published - Apr 3 1987
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters",

abstract = "Large increases in the photoionization threshold energies of small Vx, NBx, and Fex clusters (x = 3-25) induced by chemisorption of H2 have been observed using photoionization time-of-flight mass spectrometry of a molecular beam. These shifts exhibit a definite dependence both on the number of atoms constituting the bare metal cluster and on the number of chemisorbed hydrogens, and are particularly large (≳ 0.8 eV) for multiple-H2 chemisorption on small clusters. A simple frontier orbital model for the chemisorption process predicts the direction of adsorbate-induced shifts in cluster ionization threshold for both H2 and NH3 as adsorbates.",

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year = "1987",

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doi = "10.1016/0009-2614(87)85146-1",

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T1 - Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters

AU - Zakin, M. R.

AU - Cox, D. M.

AU - Whetten, R. L.

AU - Trevor, D. J.

AU - Kaldor, A.

PY - 1987/4/3

Y1 - 1987/4/3

N2 - Large increases in the photoionization threshold energies of small Vx, NBx, and Fex clusters (x = 3-25) induced by chemisorption of H2 have been observed using photoionization time-of-flight mass spectrometry of a molecular beam. These shifts exhibit a definite dependence both on the number of atoms constituting the bare metal cluster and on the number of chemisorbed hydrogens, and are particularly large (≳ 0.8 eV) for multiple-H2 chemisorption on small clusters. A simple frontier orbital model for the chemisorption process predicts the direction of adsorbate-induced shifts in cluster ionization threshold for both H2 and NH3 as adsorbates.

AB - Large increases in the photoionization threshold energies of small Vx, NBx, and Fex clusters (x = 3-25) induced by chemisorption of H2 have been observed using photoionization time-of-flight mass spectrometry of a molecular beam. These shifts exhibit a definite dependence both on the number of atoms constituting the bare metal cluster and on the number of chemisorbed hydrogens, and are particularly large (≳ 0.8 eV) for multiple-H2 chemisorption on small clusters. A simple frontier orbital model for the chemisorption process predicts the direction of adsorbate-induced shifts in cluster ionization threshold for both H2 and NH3 as adsorbates.

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SP - 223

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JO - Chemical Physics Letters

JF - Chemical Physics Letters

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Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters

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