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Physisorption of an electron in deep surface potentials off a dielectric surface | | R. L. Heinisch
; F. X. Bronold
; H. Fehske
; | | Date: |
3 Feb 2011 | | Abstract: | We study phonon-mediated adsorption and desorption of an electron at
dielectric surfaces with deep polarization-induced surface potentials where
multi-phonon transitions are responsible for electron energy relaxation.
Focusing on multi-phonon processes due to the nonlinearity of the coupling
between the external electron and the acoustic bulk phonon triggering the
transitions between surface states, we calculate electron desorption times for
graphite, MgO, CaO, ( ext{Al}_2 ext{O}_3), and ( ext{SiO}_2) and
electron sticking coefficients for ( ext{Al}_2 ext{O}_3), CaO, and
( ext{SiO}_2). To reveal the kinetic stages of electron physisorption, we
moreover study the time evolution of the image state occupancy and the
energy-resolved desorption flux. Depending on the potential depth and the
surface temperature we identify two generic scenarios: (i)adsorption via
trapping in shallow image states followed by relaxation to the lowest image
state and desorption from that state via a cascade through the second strongly
bound image state in not too deep potentials and (ii)adsorption via trapping in
shallow image states but followed by a relaxation bottleneck retarding the
transition to the lowest image state and desorption from that state via a one
step process to the continuum in deep potentials. | | Source: | arXiv, 1102.0632 | | Services: | Forum | Review | PDF | Favorites | |
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