Ultra-low frequency EPR using longitudinal detection and fictitious-field modulation.

Ultra-low frequency EPR using longitudinal detection and fictitious-field modulation.
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DOI:
10.1016/j.jmr.2020.106855
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发表时间:
2020-12
期刊:
Journal of magnetic resonance (San Diego, Calif. : 1997)
影响因子:
--
通讯作者:
Garwood M
Garwood M
中科院分区:
其他
文献类型:
--
作者:
Tang X;Suddarth S;Qian G;Garwood M

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当在旋转参照系中观察时,横平面射频(RF)场表现为纵向场分量,称为虚拟场。通过调制射频场和虚构场,可探测的纵向磁化模式先前已被证明是可测量的。通过结合虚拟场调制和纵向检测,我们在一个定制的超低频率(24 MHz)纵向检测系统中展示了EPR光谱和一维成像,用于检测具有短(~纳秒)弛豫时间的电子自旋。同时还演示了低发射机泄漏电平(~80 dB隔离)的同时发射和接收。
When viewed in a rotating frame of reference, a transverse-plane radiofrequency (RF) field manifests as a longitudinal field component called the fictitious field. By modulating the RF field and thus the fictitious field, detectable longitudinal magnetization patterns have previously been shown to be measurable. By combining fictitious-field modulation and longitudinal detection, here we demonstrate EPR spectroscopy and one-dimensional imaging in a custom-built longitudinal detection system operating at an ultra-low frequency (24 MHz) for detecting electron spins with short (~nanoseconds) relaxation times. Simultaneous transmit and receive with low transmitter leakage level (~80 dB isolation) is also demonstrated.
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