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Auger electron emission initiated by the creation of valence-band holes in graphene by positron annihilation.


ABSTRACT: Auger processes involving the filling of holes in the valence band are thought to make important contributions to the low-energy photoelectron and secondary electron spectrum from many solids. However, measurements of the energy spectrum and the efficiency with which electrons are emitted in this process remain elusive due to a large unrelated background resulting from primary beam-induced secondary electrons. Here, we report the direct measurement of the energy spectra of electrons emitted from single layer graphene as a result of the decay of deep holes in the valence band. These measurements were made possible by eliminating competing backgrounds by employing low-energy positrons (<1.25?eV) to create valence-band holes by annihilation. Our experimental results, supported by theoretical calculations, indicate that between 80 and 100% of the deep valence-band holes in graphene are filled via an Auger transition.

SUBMITTER: Chirayath VA 

PROVIDER: S-EPMC5511367 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Auger electron emission initiated by the creation of valence-band holes in graphene by positron annihilation.

Chirayath V A VA   Callewaert V V   Fairchild A J AJ   Chrysler M D MD   Gladen R W RW   Mcdonald A D AD   Imam S K SK   Shastry K K   Koymen A R AR   Saniz R R   Barbiellini B B   Rajeshwar K K   Partoens B B   Weiss A H AH  

Nature communications 20170713


Auger processes involving the filling of holes in the valence band are thought to make important contributions to the low-energy photoelectron and secondary electron spectrum from many solids. However, measurements of the energy spectrum and the efficiency with which electrons are emitted in this process remain elusive due to a large unrelated background resulting from primary beam-induced secondary electrons. Here, we report the direct measurement of the energy spectra of electrons emitted from  ...[more]

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