Low temperature coadsorption of hydrogen and carbon monoxide on Ni(100). I. TPD, Δ, and UPS studies

B. E. Koel; D. E. Peebles; J. M. White

doi:10.1016/S0039-6028(83)80056-9

Low temperature coadsorption of hydrogen and carbon monoxide on Ni(100). I. TPD, Δ, and UPS studies

B. E. Koel, D. E. Peebles, J. M. White

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146 Scopus citations

Abstract

Ultraviolet photoemission (UPS), work function change (Δ) and temperature programmed desorption (TPD) data are reported for carbon monoxide and hydrogen coadsorbed on Ni(100). Predosed hydrogen and postdosed carbon monoxide are intimately mixed and strongly coupled on Ni(100) at 100 K, but there is no evidence for direct C-H or O-H bonding. TPD shows sharp desorption peaks of both CO and H₂ around 210 K (Σ states). UPS shows that a single type of weakly adsorbed CO, Σ-CO, exists on an H-presaturated Ni(100) surface at 100 K. This species is irreversibly converted to β-CO after heating to 260 K to desorb some CO and H₂. The chemical bonding of the adsorbed CO changes significantly with the conversion from Σ to β-CO. Work function measurements show that the surface dipole associated with Σ-CO is nearly zero. The results suggest that Σ-CO has an electronic structure readily derivable from chemisorbed CO perturbed by a through-Ni interaction with hydrogen bonded to the same Ni atom or atoms.

Original language	English (US)
Pages (from-to)	709-738
Number of pages	30
Journal	Surface Science
Volume	125
Issue number	3
DOIs	https://doi.org/10.1016/S0039-6028(83)80056-9
State	Published - Mar 1 1983
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/S0039-6028(83)80056-9

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@article{e94a783c7edf43efa42974f3b97786ca,

title = "Low temperature coadsorption of hydrogen and carbon monoxide on Ni(100). I. TPD, Δ, and UPS studies",

abstract = "Ultraviolet photoemission (UPS), work function change (Δ) and temperature programmed desorption (TPD) data are reported for carbon monoxide and hydrogen coadsorbed on Ni(100). Predosed hydrogen and postdosed carbon monoxide are intimately mixed and strongly coupled on Ni(100) at 100 K, but there is no evidence for direct C-H or O-H bonding. TPD shows sharp desorption peaks of both CO and H2 around 210 K (Σ states). UPS shows that a single type of weakly adsorbed CO, Σ-CO, exists on an H-presaturated Ni(100) surface at 100 K. This species is irreversibly converted to β-CO after heating to 260 K to desorb some CO and H2. The chemical bonding of the adsorbed CO changes significantly with the conversion from Σ to β-CO. Work function measurements show that the surface dipole associated with Σ-CO is nearly zero. The results suggest that Σ-CO has an electronic structure readily derivable from chemisorbed CO perturbed by a through-Ni interaction with hydrogen bonded to the same Ni atom or atoms.",

author = "Koel, {B. E.} and Peebles, {D. E.} and White, {J. M.}",

note = "Funding Information: Many surface chemical reactions involve the interaction of coadsorbed species derived from two or more gas phase reactants. The detailed molecular level description of these reactions requires knowledge of all the kinetic, energetic, and structural parameters that determine the transformation of reactants into products. Such a description is not fully realizable, but progress can be made through the systematic use of experimental and theoretical techniques. One very important component in this process is the measurement of the electronic structure of the atomic and molecular species formed when two potentially reactive molecules are coadsorbed on a well-characterized, single-crystal metal surface under weakly-or non-reactive conditions. Under such conditions the great complexity of even the simplest reacting systems is * Supported in part by the National Science Foundation, Grant CHE80-05107. ** Proctor and Gamble Fellow of the ACS Colloid and Surface Chemistry Division. *** American Vacuum Society Scholar.",

year = "1983",

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doi = "10.1016/S0039-6028(83)80056-9",

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TY - JOUR

T1 - Low temperature coadsorption of hydrogen and carbon monoxide on Ni(100). I. TPD, Δ, and UPS studies

AU - Koel, B. E.

AU - Peebles, D. E.

AU - White, J. M.

N1 - Funding Information: Many surface chemical reactions involve the interaction of coadsorbed species derived from two or more gas phase reactants. The detailed molecular level description of these reactions requires knowledge of all the kinetic, energetic, and structural parameters that determine the transformation of reactants into products. Such a description is not fully realizable, but progress can be made through the systematic use of experimental and theoretical techniques. One very important component in this process is the measurement of the electronic structure of the atomic and molecular species formed when two potentially reactive molecules are coadsorbed on a well-characterized, single-crystal metal surface under weakly-or non-reactive conditions. Under such conditions the great complexity of even the simplest reacting systems is * Supported in part by the National Science Foundation, Grant CHE80-05107. ** Proctor and Gamble Fellow of the ACS Colloid and Surface Chemistry Division. *** American Vacuum Society Scholar.

PY - 1983/3/1

Y1 - 1983/3/1

N2 - Ultraviolet photoemission (UPS), work function change (Δ) and temperature programmed desorption (TPD) data are reported for carbon monoxide and hydrogen coadsorbed on Ni(100). Predosed hydrogen and postdosed carbon monoxide are intimately mixed and strongly coupled on Ni(100) at 100 K, but there is no evidence for direct C-H or O-H bonding. TPD shows sharp desorption peaks of both CO and H2 around 210 K (Σ states). UPS shows that a single type of weakly adsorbed CO, Σ-CO, exists on an H-presaturated Ni(100) surface at 100 K. This species is irreversibly converted to β-CO after heating to 260 K to desorb some CO and H2. The chemical bonding of the adsorbed CO changes significantly with the conversion from Σ to β-CO. Work function measurements show that the surface dipole associated with Σ-CO is nearly zero. The results suggest that Σ-CO has an electronic structure readily derivable from chemisorbed CO perturbed by a through-Ni interaction with hydrogen bonded to the same Ni atom or atoms.

AB - Ultraviolet photoemission (UPS), work function change (Δ) and temperature programmed desorption (TPD) data are reported for carbon monoxide and hydrogen coadsorbed on Ni(100). Predosed hydrogen and postdosed carbon monoxide are intimately mixed and strongly coupled on Ni(100) at 100 K, but there is no evidence for direct C-H or O-H bonding. TPD shows sharp desorption peaks of both CO and H2 around 210 K (Σ states). UPS shows that a single type of weakly adsorbed CO, Σ-CO, exists on an H-presaturated Ni(100) surface at 100 K. This species is irreversibly converted to β-CO after heating to 260 K to desorb some CO and H2. The chemical bonding of the adsorbed CO changes significantly with the conversion from Σ to β-CO. Work function measurements show that the surface dipole associated with Σ-CO is nearly zero. The results suggest that Σ-CO has an electronic structure readily derivable from chemisorbed CO perturbed by a through-Ni interaction with hydrogen bonded to the same Ni atom or atoms.

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Low temperature coadsorption of hydrogen and carbon monoxide on Ni(100). I. TPD, Δ, and UPS studies

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