Radical formation in lithium trifluoromethane-sulfonate for ESR dosimetry |
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| Authors: | G M Hassan M Ikeya C Yamanaka |
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| Institution: | (1) Department of Physics, Chemistry and Biology, IFM, Linkoping University, The Emeritus Academy, Linkoping University, SE-581 83 Linkoping, Sweden;(2) Graduate School of Engineering, Hiroshima University, 4-26-8 Takamigaoka, Takaya, Higashi-Hiroshima 739-2115, Japan;(3) Graduate School of Engineering, Nagoya Institute of Technology, 44-66 Midorigaoka, Midori-Machi, Owari-Asahi 488-0822, Japan |
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| Abstract: | Lithium trifluoromethane-sulfonate (Li-TFMS:CF3SO3Li) irradiated by γ-rays showed an electron spin resonance (ESR) powder spectrum having the rhombicg-factor ofg xx = 2.0259 ± 0.0005,g yy = 2.0112 ± 0.0005 andg zz = 2.0025 ± 0.0005 and a triplet hyperfine coupling constant ofA xx/gβ= 0.8 ± 0.15 mT.A yy andA zz are not obtained because of the broadened spectrum. The energy levels,g-factor,A xx/gβ and optical absorption spectrum of several conceivable radicals such as C⋅F2SO3Li, CF3-S-O⋅ and CF3-S-O-O⋅ have been calculated by softwares MOPAC-V2 and Gaussian-98 based on ROHF (Restricted Hatree-Fock for open shell molecule). The most probable radical was ascribed to CF3-SO⋅ from both calculated and experimental results. The response to γ-ray dose and the thermal stability have been studied in addition to the effect of UV illumination for possible use of the signal intensity in ESR dosimetry. The obtained number of free radicals per 100 eV (G-value) was 1.23 ± 0.40. |
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