Davies ENDOR再访：增强的灵敏度和核自旋弛豫
Davies ENDOR revisited: Enhanced sensitivity and nuclear spin relaxation
摘要：
在过去的50年里，电子-核双共振（ENDOR）已经成为一种相当普遍的光谱技术，允许研究与电子自旋耦合的原子核的自旋跃迁。然而，该技术的低自旋数灵敏度继续造成严重的限制。在这里，我们表明，在脉冲戴维斯ENDOR实验的信号强度强烈依赖于核弛豫时间T1 n，并可以严重减少长T1 n。我们建议开发原始Davies ENDOR序列，克服这一限制，从而提供显着增强的信号强度和光谱分辨率。最后，我们观察到，原来的戴维斯方法T1 n的灵敏度可以用来测量核弛豫，我们证明了硅中的磷供体和CS2中的内嵌富勒烯N@C60。
英文摘要：
Over the past 50 years, electron-nuclear double resonance (ENDOR) has become a fairly ubiquitous spectroscopic technique, allowing the study of spin transitions for nuclei which are coupled to electron spins. However, the low spin number sensitivity of the technique continues to pose serious limitations. Here we demonstrate that signal intensity in a pulsed Davies ENDOR experiment depends strongly on the nuclear relaxation time T1n, and can be severely reduced for long T1n. We suggest a development of the original Davies ENDOR sequence that overcomes this limitation, thus offering dramatically enhanced signal intensity and spectral resolution. Finally, we observe that the sensitivity of the original Davies method to T1n can be exploited to measure nuclear relaxation, as we demonstrate for phosphorous donors in silicon and for the endohedral fullerene N@C60 in CS2.
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