TY - JOUR
T1 - Electron paramagnetic resonance study of unpaired electron species in thin films of pyrimidine bases induced by nitrogen and oxygen K-shell photoabsorption
AU - Oka, T.
AU - Yokoya, A.
AU - Fujii, K.
N1 - Funding Information:
The authors would like to thank Dr. Y. Saitoh and Mr. Y. Fukuda in SPring-8 for their support to operate the beamline and the end-station. This study was partially supported by a Grant-in-Aid for Science Research B (Grant No. 21310041) from The Japan Society for the Promotion of Science (JSPS).
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/3/7
Y1 - 2011/3/7
N2 - In order to clarify the mechanism of DNA-base modification induced by K-shell photoabsorption of nitrogen and oxygen atoms, we measured electron paramagnetic resonance (EPR) spectra of two DNA pyrimidine bases, thymine, and cytosine. The g -factor of 2.000 of the unpaired electron species arising only during irradiation is determined. The EPR intensities for cytosine are two times larger than those simply estimated based on the photoabsorption cross section, whereas those for thymine show similar energy dependence to photoabsorption spectra, suggesting that cytosine favors to form unpaired electron species, rather than thymine, presumably due to the excitation of the enhanced electron capturing.
AB - In order to clarify the mechanism of DNA-base modification induced by K-shell photoabsorption of nitrogen and oxygen atoms, we measured electron paramagnetic resonance (EPR) spectra of two DNA pyrimidine bases, thymine, and cytosine. The g -factor of 2.000 of the unpaired electron species arising only during irradiation is determined. The EPR intensities for cytosine are two times larger than those simply estimated based on the photoabsorption cross section, whereas those for thymine show similar energy dependence to photoabsorption spectra, suggesting that cytosine favors to form unpaired electron species, rather than thymine, presumably due to the excitation of the enhanced electron capturing.
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U2 - 10.1063/1.3563712
DO - 10.1063/1.3563712
M3 - Article
AN - SCOPUS:79952654630
VL - 98
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 10
M1 - 103701
ER -