Cesium/oxide interactions for ultrathin films on {alpha}-Al{sub 2}O{sub 3}(0001) and {alpha}-Al{sub 2}O{sub 3}(1{bar 1}02)

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The interaction of cesium at the (0001) and (1{bar 1}02) surfaces of sapphire has been investigated using a variety of surface analytical techniques. Reflection mass spectrometric measurements yield initial Cs adsorption probabilities of 0.9 and 0.85 for the unreconstructed (0001) and (1{bar 1}02) surfaces, respectively. The adsorption probability decreases dramatically for these surfaces at critical Cs coverages of 2.O {times} 10{sup 14} and 3.4 {times} 10{sup 14} atoms/cm{sup 2}, respectively. Thermally induced reconstruction of the (0001) surface to form an oxygen deficient surface results in a decrease in the initial probability and capacity for Cs adsorption. Low energy electron diffraction ... continued below

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7 p.

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Zavadil, K.R. & Ing, J.L. March 1, 1995.

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  • Zavadil, K.R. Sandia National Labs., Albuquerque, NM (United States)
  • Ing, J.L. AEA Technology, Albuquerque, NM (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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The interaction of cesium at the (0001) and (1{bar 1}02) surfaces of sapphire has been investigated using a variety of surface analytical techniques. Reflection mass spectrometric measurements yield initial Cs adsorption probabilities of 0.9 and 0.85 for the unreconstructed (0001) and (1{bar 1}02) surfaces, respectively. The adsorption probability decreases dramatically for these surfaces at critical Cs coverages of 2.O {times} 10{sup 14} and 3.4 {times} 10{sup 14} atoms/cm{sup 2}, respectively. Thermally induced reconstruction of the (0001) surface to form an oxygen deficient surface results in a decrease in the initial probability and capacity for Cs adsorption. Low energy electron diffraction (LEED) demonstrates that an intermediate, mixed domain surface yields an initial adsorption probability of 0.5 while a ({radical}31 {times} {radical}31) R {plus_minus} 9{degree} reconstructed surface yields a value of 0.27. Thermal desorption mass spectrometry (TDMS) shows that surface reconstruction eliminates the high binding energy states of Cs (2.7 eV/atom), consistent with the observed changes in adsorption probability. In contrast, reconstruction of the (1{bar 1}02) surface produces only minor changes in Cs adsorption. X-ray photoelectron spectroscopy (XPS) indicates that no formal reductive/oxidative chemistry takes place at the interface. We interpret the facile adsorption and strong binding of Cs on sapphire to result from Cs interacting with coordinatively unsaturated oxygen.

Physical Description

7 p.

Notes

OSTI as DE95008159

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95008159
  • Report No.: SAND--95-0309C
  • Report No.: CONF-941144--84
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 31677
  • Archival Resource Key: ark:/67531/metadc687439

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  • March 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 14, 2016, 3:20 p.m.

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Zavadil, K.R. & Ing, J.L. Cesium/oxide interactions for ultrathin films on {alpha}-Al{sub 2}O{sub 3}(0001) and {alpha}-Al{sub 2}O{sub 3}(1{bar 1}02), article, March 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc687439/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.