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Oxygen effect on spin relaxation of the surface paramagnetic centers in carbon chars |
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| Authors: | V. A. Atsarkin V. V. Demidov G. A. Vasneva R. L. Belford B. M. Odintsov R. B. Clarkson |
| Affiliation: | 1. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Mokhovaya ulitsa 11, 125009, Moscow, Russian Federation 2. Illinois Research EPR Center, University of Illinois, Urbana, Illinois, USA 3. Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois, USA 4. Biomedical Imaging Center, University of Illinois, Urbana, Illinois, USA |
| Abstract: | The original technique with the use of longitudinal electron paramagnetic resonance detection was applied to measure longitudinal and transversal electron relaxation times (T 1 andT 2) in specially prepared carbon chars containing paramagnetic centers (PCs) on the surface. The results not only confirmed the conclusions of our previous studies but enabled us to determine the exchange integral and clarify the mechanism of interaction between the PCs and adsorbed molecular oxygen O2. A spin relaxation mechanism was also suggested which takes into account both the exchange and dipolar interactions in the systems combining PC and O2. The value of the exchange integral between PCs as well as its functional dependence on the oxygen content were estimated. |
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