A Unified Model of Secondary Electron Cascades in Diamond

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In this paper we present a detailed and unified theoretical treatment of secondary electron cascades that follow the absorption of an X-ray photon. A Monte Carlo model has been constructed that treats in detail the evolution of electron cascades induced by photoelectrons and by Auger electrons following inner shell ionizations. Detailed calculations are presented for cascades initiated by electron energies between 0.1-10 keV. The present paper expands our earlier work by extending the primary energy range, by improving the treatment of secondary electrons, especially at low electron energies, by including ionization by holes, and by taking into account their coupling ... continued below

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Ziaja, B; London, R A & Hajdu, J October 13, 2004.

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In this paper we present a detailed and unified theoretical treatment of secondary electron cascades that follow the absorption of an X-ray photon. A Monte Carlo model has been constructed that treats in detail the evolution of electron cascades induced by photoelectrons and by Auger electrons following inner shell ionizations. Detailed calculations are presented for cascades initiated by electron energies between 0.1-10 keV. The present paper expands our earlier work by extending the primary energy range, by improving the treatment of secondary electrons, especially at low electron energies, by including ionization by holes, and by taking into account their coupling to the crystal lattice. The calculations describe the three-dimensional evolution of the electron cloud, and monitor the equivalent instantaneous temperature of the free-electron gas as the system cools. The dissipation of the impact energy proceeds predominantly through the production of secondary electrons whose energies are comparable to the binding energies of the valence (40-50 eV) and of the core electrons (300 eV). The electron cloud generated by a 10 keV electron is strongly anisotropic in the early phases of the cascade (t {le} 1 fs). At later times, the sample is dominated by low energy electrons, and these are scattered more isotropically by atoms in the sample. Our results for the total late time number of secondary electrons agree with available experimental data, and show that the emission of secondary electrons approaches saturation within about 100 fs, following the primary impact.

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PDF-file: 35 pages; size: 0.4 Mbytes

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  • Journal Name: Journal of Applied Physics, vol. 97, N/A, March 4, 2005, pp. 064905; Journal Volume: 97

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  • Report No.: UCRL-JRNL-207219
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936451
  • Archival Resource Key: ark:/67531/metadc900343

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  • October 13, 2004

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 4:45 p.m.

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Ziaja, B; London, R A & Hajdu, J. A Unified Model of Secondary Electron Cascades in Diamond, article, October 13, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900343/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.