Search results for "atomic oxygen"
showing 2 items of 2 documents
Interconversion between non-bridging oxygen hole center and peroxy radical in F2-laser-irradiated SiO2 glass
2004
Formation processes of the peroxy radical (POR) were examined in high-purity SiO 2 glass exposed to F 2 -laser light which creates mobile atomic oxygen (O 0 ) by photolyzing the interstitial oxygen molecules (O 2 ). It was proved that under these conditions POR is formed by a reaction of the non-bridging oxygen hole center (NBOHC, an oxygen dangling bond) with O 0 , not by a reaction between the E' center (a silicon dangling bond) and O 2 . Subsequent exposure to KrF laser light photolyzes POR and recoveres NBOHC by dissociating the O-O bond in POR. These findings corroborate the important role of O° in defect processes in SiO 2 glass.
Theoretical characterization of the photochemical reaction CO2+O(3P)→CO+O2 related to experiments in solid krypton
2020
Formation and decomposition of the complex of carbon dioxide and atomic oxygen are characterized by quantum chemistry methods aiming to rationalize experimental studies in solid krypton. The observed FTIR spectra reflected the temporal evolution of the system after irradiation showing the bands of reactants, intermediates and products. Advanced quantum chemistry calculations show that the T-shape complex CO2…O(3P) can be formed in the matrix. Its excitation by the 193 nm light results in the charge-transfer state CO2+…O-, which evolves to the reaction intermediate CO3. The latter species decomposes to CO + O2 following pathways on the excited state energy surfaces. peerReviewed