2003/06/01 by F. Köksal, Fevzī Köksal, R. Köseoğlu +3
Agricultural and Biological Sciences · Chemistry · Environmental Science · #Analytical Chemistry (journal) #Atomic physics #Chemical Synthesis and Characterization #Chemistry #Electron paramagnetic resonance #Environmental chemistry #Geochemistry #Geology #Irradiation #Mineral #Nuclear chemistry #Nuclear magnetic resonance #Nuclear physics #Organic chemistry #Paramagnetism #Physics #Radiation Effects and Dosimetry #Radical #Resonance (particle physics) #Rhyolite #Volcanic rock #Volcano
paper · pdf · doi:10.1515/zna-2003-5-607
openalex publication_date 2003/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Rhyolite from the “Yellow Stone of Nevșehir” and γ-irradiated trona from the Ankara Mine have been investigated by electron paramagnetic resonance at ambient temperature and at 113 K. Rhyolite was examined by X-ray powder diffraction and found to consist mainly of SiO 2 . Before γ-irradiation, the existing paramagnetic species in rhyolite were identified as ṖO 4 2− , ĊH 2 OH, ĊO 3 − , ṠO 2 − , ĊO 3 3− , and ĊO 2 - free radicals and Fe 3+ at ambient temperature. At 113 K ṠO 2 - , ĊO 3 3- , and ĊO 2 − radicals and Fe 3+ were observed. The γ-irradiation produced neither new species nor detectable effects on these free radicals. The disappearance of some of the radicals at 113 K is attributed to the freezing of their motions. Before γ-irradiation, the trona mineral shows only Mn 2+ lines, but after γ-irradiation it indicated the inducement of ĊO 3 3− and ĊO 2 - radicals at ambient temperature, 113 K, in addition to the Mn 2+ lines. The g and a values of the species were determined.