Frequency dependence of EPR signal intensity, 250 MHz to 9.1 GHz
Frequency dependence of EPR signal intensity, 250 MHz to 9.1 GHz
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DOI：
10.1006/jmre.2002.2530
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发表时间：
2002-05-01
影响因子：
2.2
通讯作者：
Eaton, GR
中科院分区：
文献类型：
--
作者：
Rinard, GA;Quine, RW;Eaton, GR
在250 MHz，1.5 GHz和9.1 GHz的实验EPR信号强度同意实验误差与第一原理的预测。当谐振器尺寸和样本尺寸都用RF/微波频率ω的倒数缩放时，常数B-1处的EPR信号缩放为ω（-1/4）。对两对环隙谐振器中的三种不同样品进行了比较。每一对的几何比例为6倍。一对谐振器从250 MHz扩展到1.5 GHz，另一对从1.5 GHz扩展到9 GHz。比较中的所有项都是直接测量的，并估计了它们的不确定性。该理论预测，较低频率的信号将比较高频率的信号大1.57的比率。对于250 MHz至1.5 GHz，实验比值为1.52，对于1.5 GHz至9 GHz的比较，比值为1.14。(C)2002 Elsevier Science（美国）。
Experimental EPR signal intensities at 250 MHz, 1.5 GHz, and 9.1 GHz agree within experimental error with predictions from first principles. When both the resonator size and the sample size are scaled with the inverse of RF/microwave frequency, omega, the EPR signal at constant B-1 scales as omega(-1/4). Comparisons were made for three different samples in two pairs of loop gap resonators. Each pair was geometrically scaled by a factor of 6. One pair of resonators was scaled from 250 MHz to 1.5 GHz, and the other pair was scaled from 1.5 GHz to 9 GHz. All terms in the comparison were measured directly, and their uncertainties estimated. The theory predicts that the signal at the lower frequency will be larger than the signal at the higher frequency by the ratio 1.57. For 250 MHz to 1.5 GHz, the experimental ratio was 1.52 and for the 1.5-GHz to 9-GHz comparison the ratio was 1.14. (C) 2002 Elsevier Science (USA).