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    An EPR study on single crystals of dimethyl-1,3-cyclohexanedione by gamma-rays
    (TAYLOR & FRANCIS LTD, 2012) Aras, Erdal; Usta, Ayhan; Erturk, Serkan; Asik, Biray
    Single crystals of dimethyl-1,3-cyclohexanedione (C8H12O2) were produced by slow evaporation of the concentrated ethyl acetate solutions. These single crystals were exposed to Co-60 gamma-rays with a dose speed of 0.950 kGy/h at room temperature for 24, 48, and 72 h. The free radicals of the samples irradiated for 48 and 72 h were detected using electron paramagnetic resonance (EPR)-X-band spectrometer. EPR measurements were performed between 120 and 300 K. The sample irradiated for 48 h by gamma-rays was rotated in steps of 10 degrees at 298 K. The spectrum parameters were found to be dependent on the temperature. Two radicals were determined in the molecular structure irradiated. These radiation damage centers were called R1 and R2. The average values of g and the hyperfine coupling constants were calculated as follows: a(Ha) = 6.84 G, a(Hb) = 3.60 G, g = 2.0040 for R1, a(H) = 28 G, g = 2.0062 for R2.
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    EPR study of gamma-irradiated N-hydroxysuccinimide
    (TAYLOR & FRANCIS LTD, 2008) Asik, Biray; Aras, Erdal; Birey, Mehmet; Eken, Mahmut
    The electron paramagnetic resonance of gamma-irradiated single crystal of N-hydroxysuccinimide has been studied for different orientations of the crystals in a magnetic field. The radicals produced by gamma-irradiation have been investigated between 150 and 300 K. The spectra were found to be temperature independent and radiation damage centers were attributed to [GRAPHICS] radicals.
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    EPR study of gamma-irradiated tetra-N-butylammonium iodide
    (TAYLOR & FRANCIS LTD, 2012) Merdan, Mehmet Ali; Asik, Biray; Birey, Mehmet; Aras, Erdal
    The electron paramagnetic resonance of gamma-irradiated single crystal of tetra-N-butylammonium iodide has been studied for different orientations of the crystals in a magnetic field. The radical produced by gamma irradiation has been investigated at 300 K. The spectra were found to be magnetic field dependent and radiation damage centers were attributed to the (C alpha H2C beta H2C gamma H2CH3) radical. The principal values of the hyperfine coupling tensor of the unpaired electron with these atoms and the principal values of the gtensor were determined and the hyperfine coupling constants were verified by computer simulation. The results were found to be in good agreement with the existing literature data and theoretical predictions.