6533b851fe1ef96bd12aa0e5

RESEARCH PRODUCT

Optical properties of oxygen-deficiency related centers in amorphous SiO 2 investigated by synchrotron radiation

Marco CannasSimonpietro AgnelloB. BoizotFranco Mario GelardiMaurizio LeoneRoberto Boscaino

subject

Nuclear and High Energy PhysicsRadiationPhotoluminescenceChemistryAnalytical chemistrySynchrotron radiationCondensed Matter PhysicsAmorphous solidAmplitudeNuclear magnetic resonanceExcited stateGeneral Materials ScienceIrradiationAbsorption (electromagnetic radiation)Excitation

description

We report an investigation of the photoluminescence activity at 4.4 v eV in g -irradiated silica under UV and vacuum-UV excitation by synchrotron radiation. Our results evidence two iso-energetic contributions which can be related to two oxygen-deficient centers variants: ODC(I) and ODC(II). The first, excited within the 7.6 v eV absorption, is detected only at low temperature and has a lifetime of about 2 v ns. The second exhibits two excitation maxima peaked at 5.0 and 6.8 v eV, its amplitude decreases by a factor 2 on increasing the temperature whereas its lifetime has a value of about 4 v ns. These features give new insights on the excitation pathway of the 4.4 v eV emission involving the conversion from ODC(I) towards ODC(II).

yearjournalcountryeditionlanguage
2002-01-01Radiation Effects and Defects in Solids
https://doi.org/10.1080/10420150215777