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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Chemically Induced Multiplet Electron-Nuclear Polarization in Zero and Low Magnetic Fields
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Chemically Induced Multiplet Electron-Nuclear Polarization in Zero and Low Magnetic Fields

机译：零磁场和低磁场中化学诱导的多重电子-核极化

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摘要

We report the first observation of chemically induced electronic-nuclear multiplet spin polarization of transient radicals at very low and zero magnetic fields. Dimethoxyphosphonyl radicals, which have a hyperfine coupling constant of ～70 mT, were produced in solution by photolysis of 2,4,6-trimethylbenzoyl phosphonic acid dimethyl ester. The radicals were detected using a modified L-band time-resolved electron paramagnetic resonance (TREPR) setup. The polarization is very strong, and signals are easily detected with custom-built resonators that match or nearly match each electronic-nuclear transition. A theoretical description for the formation of this large polarization has been proposed and is found to be in good agreement with experimental data. TREPR spectra and time-resolved kinetics at low and high magnetic fields have been measured. Signals detected at high magnetic field decay an order of magnitude faster than do those at low field, which can be explained by field-dependent HFI-induced spin relaxation.
机译：我们报告了在非常低的磁场和零磁场下化学诱导的瞬态自由基的电子核多重自旋极化的观察结果。通过对2,4,6-三甲基苯甲酰基膦酸二甲酯的光解，在溶液中产生了〜70 mT的超精细偶合常数的二甲氧基膦酰基。使用改良的L波段时间分辨电子顺磁共振（TREPR）装置检测自由基。极化非常强，并且可以使用匹配或几乎匹配每个电子核跃迁的定制谐振器轻松检测信号。已经提出了形成这种大极化的理论描述，并且发现与实验数据非常吻合。已经测量了TREPR光谱和在低磁场和高磁场下的时间分辨动力学。在高磁场下检测到的信号比在低磁场下检测到的信号衰减快一个数量级，这可以通过与磁场有关的HFI引起的自旋弛豫来解释。

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