Interaction of O[sub 2] with Li-Au and Cs-Au films. A photoemission and thermal desorption study

Rodriguez, J A; Hrbek, J; Kuhn, M; Sham, T K

doi:10.1021/j100120a029

Title: Interaction of O[sub 2] with Li-Au and Cs-Au films. A photoemission and thermal desorption study

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Abstract

The reaction of O[sub 2] with thick Li-Au or Cs-Au films supported on Ru(001) has been investigated using thermal desorption mass spectroscopy and core- and valence-level photoemission. The interaction of O[sub 2] with CsAu at 100 K produces O[sub 2][sup [minus]] (the only oxygen species at low O[sub 2] exposures) and O[sub 2][sup [minus]]. Annealing of the O[sub 2]/CsAu film to 300 K leads to the disappearance of O[sub 2] and the appearance of O[sup 2[minus]]. The adsorption of O[sub 2] on Li-Au alloys at 300 K produces the O[sub 2][sup [minus]] ion together with another oxygen species. The presence of oxygen shifts the Au(4f) and Cs(3d) levels of CsAu approximately 1 eV toward lower binding energy, with the final peak positions being very close to those observed for metallic Au and oxidized Cs. A similar result was observed for O[sub 2]/Li-Au. No evidence for bonding between the oxygen ions and Au was found. At T [le] 300 K, oxygen breaks the Au-alkali bonds to form Li-O or Cs-O and very small Au clusters that are dispersed on the film. Annealing to 500 K produces sintering of these Au clusters into large three-dimensional particles. The existence of Li-O or Cs-Omore »« less

Authors:

Rodriguez, J A; Hrbek, J ^[1]; Kuhn, M; Sham, T K ^[2]

Brookhaven National Lab., Upton, NY (United States)
Univ. of Western Ontario, London (Canada)

Publication Date:: Thu May 06 00:00:00 EDT 1993

OSTI Identifier:: 6297819

DOE Contract Number:: AC02-76CH00016

Resource Type:: Journal Article

Journal Name:: Journal of Physical Chemistry; (United States)

Additional Journal Information:: Journal Volume: 97:18; Journal ID: ISSN 0022-3654

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CESIUM ALLOYS; CHEMICAL REACTIONS; SORPTIVE PROPERTIES; GOLD ALLOYS; LITHIUM ALLOYS; OXYGEN; ADSORPTION; DESORPTION; ANNEALING; EXPERIMENTAL DATA; FILMS; MASS SPECTROSCOPY; PHOTOEMISSION; RUTHENIUM; ULTRAHIGH VACUUM; ALLOYS; DATA; ELEMENTS; EMISSION; HEAT TREATMENTS; INFORMATION; METALS; NONMETALS; NUMERICAL DATA; PLATINUM METALS; SECONDARY EMISSION; SORPTION; SPECTROSCOPY; SURFACE PROPERTIES; TRANSITION ELEMENTS; 400201* - Chemical & Physicochemical Properties; 400102 - Chemical & Spectral Procedures

Citation Formats


                    Rodriguez, J A, Hrbek, J, Kuhn, M, and Sham, T K. Interaction of O[sub 2] with Li-Au and Cs-Au films. A photoemission and thermal desorption study.  United States: N. p., 1993. 
        Web.  doi:10.1021/j100120a029.

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                    Rodriguez, J A, Hrbek, J, Kuhn, M, & Sham, T K. Interaction of O[sub 2] with Li-Au and Cs-Au films. A photoemission and thermal desorption study.  United States.  https://doi.org/10.1021/j100120a029

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                    Rodriguez, J A, Hrbek, J, Kuhn, M, and Sham, T K. 1993.  
        "Interaction of O[sub 2] with Li-Au and Cs-Au films. A photoemission and thermal desorption study".  United States.  https://doi.org/10.1021/j100120a029.

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@article{osti_6297819,

  title        = {Interaction of O[sub 2] with Li-Au and Cs-Au films. A photoemission and thermal desorption study},

  author       = {Rodriguez, J A and Hrbek, J and Kuhn, M and Sham, T K},

  abstractNote = {The reaction of O[sub 2] with thick Li-Au or Cs-Au films supported on Ru(001) has been investigated using thermal desorption mass spectroscopy and core- and valence-level photoemission. The interaction of O[sub 2] with CsAu at 100 K produces O[sub 2][sup [minus]] (the only oxygen species at low O[sub 2] exposures) and O[sub 2][sup [minus]]. Annealing of the O[sub 2]/CsAu film to 300 K leads to the disappearance of O[sub 2] and the appearance of O[sup 2[minus]]. The adsorption of O[sub 2] on Li-Au alloys at 300 K produces the O[sub 2][sup [minus]] ion together with another oxygen species. The presence of oxygen shifts the Au(4f) and Cs(3d) levels of CsAu approximately 1 eV toward lower binding energy, with the final peak positions being very close to those observed for metallic Au and oxidized Cs. A similar result was observed for O[sub 2]/Li-Au. No evidence for bonding between the oxygen ions and Au was found. At T [le] 300 K, oxygen breaks the Au-alkali bonds to form Li-O or Cs-O and very small Au clusters that are dispersed on the film. Annealing to 500 K produces sintering of these Au clusters into large three-dimensional particles. The existence of Li-O or Cs-O bonds increases the thermal stability of the alkali in the film. The Li-O and Cs-O compounds decompose at much higher temperatures than the LiAu and CsAu alloys. 28 refs., 10 figs., 2 tabs.},

  doi          = {10.1021/j100120a029},

  url          = {https://www.osti.gov/biblio/6297819},
  journal      = {Journal of Physical Chemistry; (United States)},

  issn         = {0022-3654},

  number       = ,

  volume       = 97:18,

  place        = {United States},

  year         = {Thu May 06 00:00:00 EDT 1993},

  month        = {Thu May 06 00:00:00 EDT 1993}

}

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