Electron irradiation damage and color centers of MgO nanocube

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DOIResolve DOI: http://doi.org/10.1016/j.nimb.2013.08.042
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Journal titleNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Pages137143; # of pages: 7
SubjectBroad-band lasers; Coulomb attraction; Electron irradiation damage; Energy-loss spectroscopy; High energy electron beams; MgO; Positively charged; Color centers; Electron energy loss spectroscopy; Electrons; Transmission electron microscopy; Vacancies; Magnesia; EELS; TEM
AbstractMagnesium oxide (MgO) has been of interest for several decades as a promising tunable broadband laser due to its vacancy defects (color centers). In this work we introduced color centers into MgO nanocube by electron irradiation in a transmission electron microscope (TEM). Square nano-holes were formed from the electron-exit face using 100 and 300 keV electrons, and a broad O-vacancy (color-center) absorption peak around 4.1-6.6 eV was observed by valence-electron energy-loss spectroscopy (VEELS). We investigated the mechanism of MgO damage by high-energy electron beams. The hole formation is believed to involve a mixed removal of diatomic MgO molecules as well as Mg and O species in stoichiometric proportion. Observations using high-resolution transmission electron microscopy (HRTEM) and VEELS suggest that bulk O-vacancies are generated near the electron-exit face, due to the forward momentum transferred from fast-electron collisions and the Coulomb attraction of negative O-ions by the positively charged MgO surface. © 2013 Elsevier B.V. All rights reserved.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21271841
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Record identifierb5a22712-0573-4d6c-853f-b3e2a1a71de8
Record created2014-04-23
Record modified2016-05-09
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