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Photoelectron Emission from the Cesiated Diamond (110) Surface

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Abstract

Cesiation of type IIB diamond (110) crystals was studied using a combination of ultraviolet photoemission spectroscopy, x-ray photoemission spectroscopy, and low energy electron diffraction. The diamond (110) crystal was hydrogen treated by exposure to a hydrogen microwave discharge. Although cesium was largely unreactive with the hydrogenated diamond surface, cesiation yielded a large enhancement in the secondary electron yield of the diamond surface and the negative electron affinity (NEA) condition. An increase in the downwards band bending of approximately 0.75-0.9 eV was inferred from the shift in the valence band edge following cesiation. In addition, (1×1) LEED patterns were observed at all cesium coverages. Exposure of the cesiated diamond surface to molecular oxygen significantly reduced the NEA peak (relative to the secondary electron background); however, recovery of the NEA peak was observed when the molecular oxygen source was removed.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Stanford University, USA

    C. A. Fox, M. A. Kelly & S. B. Hagstrom

  2. Stanford Synchotron Radiation Laboratory, Stanford Linear Accelerator Center, USA

    R. Cao, G. Vergara & P. Pianetta

  3. Sandia National Laboratory, Livermore, CA, USA

    L. S. Pan & W. L. Hsu

Authors
  1. C. A. Fox
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  2. M. A. Kelly
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  3. S. B. Hagstrom
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  4. R. Cao
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  5. G. Vergara
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  6. P. Pianetta
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  7. L. S. Pan
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  8. W. L. Hsu
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Fox, C.A., Kelly, M.A., Hagstrom, S.B. et al. Photoelectron Emission from the Cesiated Diamond (110) Surface. MRS Online Proceedings Library 416, 449–454 (1995). https://doi.org/10.1557/PROC-416-449

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  • DOI: https://doi.org/10.1557/PROC-416-449

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