Identification of paramagnetic radicals in gamma-irradiated natural diatomite minerals by electron paramagnetic resonance

Koseoglu R., Koksal F., Çiftçi E., Akkurt M.

JOURNAL OF MOLECULAR STRUCTURE, vol.733, no.1-3, pp.151-154, 2005 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 733 Issue: 1-3
  • Publication Date: 2005
  • Doi Number: 10.1016/j.molstruc.2004.08.005
  • Journal Name: JOURNAL OF MOLECULAR STRUCTURE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.151-154
  • Keywords: EPR, diatomite, gamma-irradiation, free radicals, SPIN-RESONANCE, ESR, CENTERS, PHOSPHATE
  • Ondokuz Mayıs University Affiliated: No

Abstract

In this study, gamma-irradiated natural diatomite minerals were investigated by electron paramagnetic resonance (EPR) spectroscopy at ambient temperature. The paramagnetic radicals produced by gamma-irradiation in natural diatomite minerals at ambient temperature were free radicals. These centers were found to be perfectly attributed to CH3, PO42-, CO2-, organic (probably, humic or fluvic acid), SO2- and SO3- observable at below 20 mW microwave power. The g values of all the paramagnetic centers were obtained, and some of their a values were reported. The results were found to be consistent with the existing literature data and theoretical predictions for similar paramagnetic centers. (C) 2004 Elsevier B.V. All rights reserved.