Enhanced sensitivity of electron-nuclear double resonance (ENDOR) by cross polarisation and relaxation
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چکیده
منابع مشابه
Enhanced sensitivity of electron-nuclear double resonance (ENDOR) by cross polarisation and relaxation.
Electron-nuclear double resonance (ENDOR) is a method of choice to detect magnetic nuclei in the coordination sphere of paramagnetic molecules, but its sensitivity substantially suffers from saturation effects. Recently we introduced a new pulsed ENDOR experiment based on electron-nuclear cross polarisation (CP) transfer. Here we analyse the time evolution of the spin polarization in CP-ENDOR a...
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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 stron...
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We describe a spectrometer for pulsed ENDOR at 140 GHz, which is based on microwave IMPATT diode amplifiers and a probe consisting of a TE011 cavity with a high-quality resonance circuit for variable radiofrequency irradiation. For pulsed EPR we obtain an absolute sensitivity of 3x10(9) spins/Gauss at 20 K. The performance of the spectrometer is demonstrated with pulsed ENDOR spectra of a stand...
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The advanced electron paramagnetic resonance (EPR) techniques, electron nuclear double resonance (ENDOR) and electron spin echo envelope modulation (ESEEM) spectroscopies, provide unique insights into the structure, coordination chemistry, and biochemical mechanism of nature's widely distributed iron-sulfur cluster (FeS) proteins. This review describes the ENDOR and ESEEM techniques and then pr...
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A rotating-frame nuclear-double-resonance experiment is reported in which the cross-relaxation rates between Li and Li in powdered lithium metal were measured, The theory developed by McArthur, Hahn, and W'alstedt (MHW) is applied to these data and good agreement is obtained. We also apply this theory to other published experimental data (LiF by Lang and Moran and adamantane by Pines and Shattu...
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ژورنال
عنوان ژورنال: Physical Chemistry Chemical Physics
سال: 2014
ISSN: 1463-9076,1463-9084
DOI: 10.1039/c3cp55395g