Pulsed 95 GHz high-field EPR heterodyne spectrometer with high spectral and time resolution
Pulsed 95 GHz high-field EPR heterodyne spectrometer with high spectral and time resolution
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具有高光谱和时间分辨率的脉冲 95 GHz 高场 EPR 外差光谱仪
DOI：
10.1007/bf03162610
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发表时间：
1994
影响因子：
1
通讯作者：
K. Möbius
中科院分区：
文献类型：
--
作者：
T. Prisner;M. Rohrer;K. Möbius
不同的时间分辨EPR方法应用于不同的测试样品，以证明脉冲高场EPR光谱的能力。双脉冲回波场扫描EPR光谱的氮氧自由基显示增加的光谱分辨率分离不同的自旋系统，其弛豫性能。此外，在高达3.5 T的磁场下，观察到这些系统的N14电子自旋回波包络调制（ESEEM）。因此，N14超精细相互作用耦合可以通过ESEEM和脉冲ENDOR（电子-核-双共振）实验来探测。比较了脉冲ENDOR实验和连续波ENDOR实验的灵敏度。讨论了两种方法的线宽和振幅的不同。光致三重态的瞬态章动实验证明了高场脉冲EPR的高灵敏度和时间分辨率。我们的95 GHz谱仪的灵敏度和时间分辨率进行了测定，并与脉冲X波段EPR谱仪的性能进行了比较。
Various time resolved EPR methods are applied to different test samples to demonstrate the abilities of pulsed high-field EPR spectroscopy. Two-pulse-echo field swept EPR spectroscopy on a nitroxide radical shows the increased spectral resolution by separating different spin systems by their relaxation properties. Additionally N14 electron-spin-echo-envelope-modulation (ESEEM) is observed for these systems at fields as high as 3.5 T. Thus, the N14 hyperfine interaction couplings can be probed by ESEEM and pulsed ENDOR (electron-nuclear-double-resonance) experiments. The sensitivity of pulsed ENDOR experiments is compared with cw-ENDOR. The different linewidths and amplitudes of the two methods are discussed. Transient nutation experiments on light induced triplet states demonstrate the high sensitivity and time resolution of high-field pulsed EPR. The sensitivity and time resolution of our 95 GHz spectrometer are determined and compared with pulsed X-band EPR spectrometer performances.
P700 的 g 张量测量。
DOI：
10.1073/pnas.90.20.9485
发表时间：
1993
影响因子：
11.1
作者：
Prisner,TF;McDermott,AE;Un,S;Norris,JR;Thurnauer,MC;Griffin,RG
通讯作者：
Griffin,RG