Phonon-mediated desorption of image-bound electrons from dielectric surfaces

Heinisch, R L; Bronold, F X; Fehske, H

doi:10.1103/PHYSREVB.81.155420

Title: Phonon-mediated desorption of image-bound electrons from dielectric surfaces

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Abstract

A complete kinetic modeling of an ionized gas in contact with a surface requires the knowledge of the electron desorption time and the electron sticking coefficient. We calculate the desorption time for phonon-mediated desorption of an image-bound electron as it occurs, for instance, on dielectric surfaces where desorption channels involving internal electronic degrees of freedom are closed. Because of the large depth of the polarization-induced surface potential with respect to the Debye energy, multiphonon processes are important. To obtain the desorption time, we use a quantum-kinetic rate equation for the occupancies of the bound-electron surface states, taking two-phonon processes into account in cases where one-phonon processes yield a vanishing transition probability as it is sufficient, for instance, for graphite. For an electron desorbing from a graphite surface at 360 K, we find a desorption time of 2x10{sup -5} s. We also demonstrate that depending on the potential depth and bound-state level spacing, the desorption scenario changes. In particular, we show that desorption via cascades over bound states dominates unless direct one-phonon transitions from the lowest bound state to the continuum are possible.

Authors:

Heinisch, R L; Bronold, F X; Fehske, H ^[1]

Institut fuer Physik, Ernst-Moritz-Arndt-Universitaet Greifswald, 17489 Greifswald (Germany)

Publication Date:: Thu Apr 15 00:00:00 EDT 2010

OSTI Identifier:: 21366729

Resource Type:: Journal Article

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 81; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevB.81.155420; (c) 2010 The American Physical Society; Journal ID: ISSN 1098-0121

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BOUND STATE; COMPUTERIZED SIMULATION; DEGREES OF FREEDOM; DESORPTION; DIELECTRIC MATERIALS; ELECTRONS; GRAPHITE; PHONONS; POLARIZATION; REACTION KINETICS; SURFACE POTENTIAL; SURFACES; TEMPERATURE RANGE 0273-0400 K; CARBON; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; KINETICS; LEPTONS; MATERIALS; MINERALS; NONMETALS; POTENTIALS; QUASI PARTICLES; SIMULATION; SORPTION; TEMPERATURE RANGE

Citation Formats


                    Heinisch, R L, Bronold, F X, and Fehske, H. Phonon-mediated desorption of image-bound electrons from dielectric surfaces.  United States: N. p., 2010. 
        Web.  doi:10.1103/PHYSREVB.81.155420.

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                    Heinisch, R L, Bronold, F X, & Fehske, H. Phonon-mediated desorption of image-bound electrons from dielectric surfaces.  United States.  https://doi.org/10.1103/PHYSREVB.81.155420

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                    Heinisch, R L, Bronold, F X, and Fehske, H. 2010.  
        "Phonon-mediated desorption of image-bound electrons from dielectric surfaces".  United States.  https://doi.org/10.1103/PHYSREVB.81.155420.

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@article{osti_21366729,

  title        = {Phonon-mediated desorption of image-bound electrons from dielectric surfaces},

  author       = {Heinisch, R L and Bronold, F X and Fehske, H},

  abstractNote = {A complete kinetic modeling of an ionized gas in contact with a surface requires the knowledge of the electron desorption time and the electron sticking coefficient. We calculate the desorption time for phonon-mediated desorption of an image-bound electron as it occurs, for instance, on dielectric surfaces where desorption channels involving internal electronic degrees of freedom are closed. Because of the large depth of the polarization-induced surface potential with respect to the Debye energy, multiphonon processes are important. To obtain the desorption time, we use a quantum-kinetic rate equation for the occupancies of the bound-electron surface states, taking two-phonon processes into account in cases where one-phonon processes yield a vanishing transition probability as it is sufficient, for instance, for graphite. For an electron desorbing from a graphite surface at 360 K, we find a desorption time of 2x10{sup -5} s. We also demonstrate that depending on the potential depth and bound-state level spacing, the desorption scenario changes. In particular, we show that desorption via cascades over bound states dominates unless direct one-phonon transitions from the lowest bound state to the continuum are possible.},

  doi          = {10.1103/PHYSREVB.81.155420},

  url          = {https://www.osti.gov/biblio/21366729},
  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  issn         = {1098-0121},

  number       = 15,

  volume       = 81,

  place        = {United States},

  year         = {Thu Apr 15 00:00:00 EDT 2010},

  month        = {Thu Apr 15 00:00:00 EDT 2010}

}

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