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EPR of Radiation-Induced Nitrogen Centers in Hydroxyapatite: New Approaches to the Study of Electron-Nuclear Interactions
Russian Journal of Coordination Chemistry ( IF 1.1 ) Pub Date : 2020-11-17 , DOI: 10.1134/s1070328420110044
F. F. Murzakhanov , G. V. Mamin , M. A. Goldberg , A. V. Knotko , M. R. Gafurov , S. B. Orlinskii

Abstract

Radiation-induced impurity nitrogen centers (\({\text{NO}}_{3}^{{2 - }}\)) in nanosized powders of synthetic hydroxyapatite are studied by pulse EPR and pulse double-frequency EPR, which is named the NMR detected by electron–electron double resonance (ELDOR detected NMR, EDNMR) method. The EPR signals caused by the interaction of the electron of \({\text{NO}}_{3}^{{2 - }}\) with the environmental nuclei (1H, 14N, and 31P) are identified, and the parameters of the hyperfine and quadrupole interactions of the electron with the 14N nuclei are determined. The possibility of using the EDNMR method in the X-band of microwave frequencies (νmw ≈ 9 GHz) at room temperature to obtain a detailed information about peculiarities of electron-nuclear interactions in hydroxyapatite is demonstrated.



中文翻译:

羟基磷灰石中辐射诱导的氮中心的EPR:电子-核相互作用研究的新方法

摘要

利用脉冲EPR和脉冲双频EPR研究了合成羟基磷灰石纳米粉体中辐射诱导的杂质氮中心(\({\ text {NO}} _ {3} ^ {{2-}} \)}。命名为通过电子-电子双共振检测到的NMR(ELDOR检测到的NMR,EDNMR)方法。确定了由\({{text {NO}} _ {3} ^ {{2-}} \}的电子与环境原子核(1 H,14 N和31 P)相互作用引起的EPR信号,并确定了电子与14 N核的超精细和四极相互作用的参数。在微波频率的X波段使用EDNMR方法的可能性(ν MW ≈9 GHz)在室温下获得有关羟基磷灰石中电子核相互作用特性的详细信息。

更新日期:2020-11-17
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