Time resolved luminescence spectroscopy of alkaline earth oxides after pulsed electron beam irradiation. I. Spectra and thresholds of CaO and CaO:Mg

Journal Article · Fri Apr 01 04:00:00 EST 1988 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.453823· OSTI ID:5250303

Grant, J L; Cooper, R; Boas, J F

Time resolved luminescence spectroscopy has been used to study the emissions occurring in CaO and CaO:Mg in the range 20 ns to 100 ms after irradiation with nanosecond duration pulses of electrons of energy between 0.2 and 3.0 MeV. An emission at 375 nm in pure CaO with a threshold energy of 0.29 +- 0.2 MeV is attributed to processes resulting from the displacement of oxygen anions and the formation of F/sup +/ centers. A related emission in CaO:Mg is attributed to displacements involving oxygen anions and the formation of F/sup +//sub Mg/ centers. An emission at 560 nm observed in both CaO and CaO:Mg with a threshold energy )similarreverse arrowto)0.7 MeV is attributed to processes resulting from cation displacement. A surprising consequence of these observations is that the displacement energies of oxygen ions in the CaO lattice appear to be lower ()similarreverse arrowto)50 eV for CaO and )similarreverse arrowto)35 eV in CaO:Mg) than that of the calcium cations ()similarreverse arrowto)65 eV).

• Research Organization: Department of Physical Chemistry, University of Melbourne, Parkville, Victoria 3052, Australia
• OSTI ID: 5250303
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 88:7; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BEAMS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DECOMPOSITION
ELECTRON BEAMS
EMISSION SPECTRA
ENERGY RANGE
F CENTERS
KEV RANGE
KEV RANGE 100-1000
LEPTON BEAMS
LUMINESCENCE
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MEV RANGE
MEV RANGE 01-10
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
POINT DEFECTS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
SPECTRA
VACANCIES