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首页> 外文期刊>Applied Magnetic Resonance >Electron spin T-2 of a nitroxyl radical at 250 MHz measured by rapid-scan EPR
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Electron spin T-2 of a nitroxyl radical at 250 MHz measured by rapid-scan EPR

机译：快速扫描EPR测量的250 MHz上的硝酰基自由基的电子自旋T-2

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摘要

Rapid-scan electron paramagnetic resonance (EPR) was used to measure the room temperature spin-spin relaxation time T-2 for the per-deuterated nitroxyl radical, 4-oxo-2,2,6,6-tetramethyl-piperidin-1-oxyl-d(16) in water at 250 MHz. Signals were recorded on a locally constructed system using either sinusoidal or triangular magnetic field scans. Values of T-2 were obtained by simulation of the rapid-scan response and were systematically shorter for the high-field line (m, = - 1) than for the m, = 0 or + 1 lines. For m, = + 1, the value of T-2 increased from 0.41 +/- 0.03 mu s at 0.5 mM to 0.53 +/- 0.03 mu s at 0.1 or 0.2 mM. For m, = - 1, T2 increased from 0.35 0.03 mu s at 0.5 mM to 0.42 +/- 0.03 mu s at 0.1 or 0.2 mM. These values put lower bounds on the values of T, for this nitroxyl at 250 MHz.
机译：快速扫描电子顺磁共振（EPR）用于测量每个氘代硝氧基自由基4-oxo-2,2,6,6-四甲基哌啶-1-的室温自旋自旋弛豫时间T-2水中的oxyl-d（16）在250 MHz下。使用正弦或三角磁场扫描将信号记录在本地构建的系统上。 T-2的值是通过模拟快速扫描响应获得的，对于高场线（m，=-1），其系统性地要短于m，= 0或+ 1线。对于m = + 1，T-2的值从0.5 mM时的0.41 +/- 0.03μs增加到0.1或0.2 mM时的0.53 +/- 0.03μs。对于m =-1，T2从0.5 mM时的0.35 0.03μs增加到0.1或0.2 mM时的0.42 +/- 0.03μs。对于该硝酰基在250 MHz时，这些值将T的下限。

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