Reversal of Paramagnetic Effects by Electron Spin Saturation
| العنوان: | Reversal of Paramagnetic Effects by Electron Spin Saturation |
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| المؤلفون: | Asif Equbal, Songi Han, Ting A. Siaw, Christopher B. Wilson, Sheetal K. Jain, Ilia Kaminker |
| المصدر: | The Journal of Physical Chemistry C. 122:5578-5589 |
| بيانات النشر: | American Chemical Society (ACS), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Nitroxide mediated radical polymerization, Materials science, 010405 organic chemistry, Electron, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Paramagnetism, General Energy, Nuclear magnetic resonance, law, Excited state, Condensed Matter::Strongly Correlated Electrons, Irradiation, Physical and Theoretical Chemistry, Electron paramagnetic resonance, Saturation (magnetic), Microwave |
| الوصف: | We present a study in which both significant dynamic nuclear polarization (DNP) enhancement of 7Li NMR and reversal of the paramagnetic effects (PEs) are achieved by microwave (μw) irradiation-induced electron spin saturation of nitroxide radicals at liquid-helium temperatures. The reversal of the PE was manifested in significant narrowing of the 7Li NMR line and reversal of the paramagnetic chemical shift under DNP conditions. The extent of the PE was found to decrease with increased saturation of the electron paramagnetic resonance line, modulated as a function of microwave (μw) power, frequency, duration of irradiation, and gating time between μw irradiation and NMR detection. The defining observation was the shortening of the electron phase memory time, Tm, of the excited observer spins with increasing μw irradiation and concurrent electron spin saturation of the electron spin bath. This and a series of corroborating studies reveal the origin of the NMR line narrowing to be the reversal of paramagneti... |
| تدمد: | 1932-7455 1932-7447 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::3ae8b23565c329f119a36c077bbcc45d https://doi.org/10.1021/acs.jpcc.8b00312 |
| رقم الأكسشن: | edsair.doi...........3ae8b23565c329f119a36c077bbcc45d |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 19327455 19327447 |
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