Electron paramagnetic resonance of rhyolite and ?-irradiated Trona minerals
Küçük Resim Yok
Tarih
2003
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Verlag der Zeitschrift fur Naturforschung
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Rhyolite from the "Yellow Stone of Nevşehir" and ?-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 SO2. Before ?-irradiation, the existing paramagnetic species in rhyolite were identified as ?O4 2-, CH2OH, CO3 -, ?O2 -, CO3 3-, and CO2 - free radicals and Fe3+ at ambient temperature. At 113 K ?O2 -, CO3 3-, and CO2 - radicals and Fe3+ were observed. The ?-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 ?-irradiation, the trona mineral shows only Mn2+ lines, but after ?-irradiation it indicated the inducement of CO3 3- and CO2 - radicals at ambient temperature, 113 K, in addition to the Mn2+ lines. The g and a values of the species were determined.
Açıklama
Anahtar Kelimeler
Electron Paramagnetic Resonance, Free Radicals, Rhyolite, Silicate, Trona, ?-Irradiation
Kaynak
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
58
Sayı
45448
