Encyclopedia of Inorganic Chemistry 2005
DOI: 10.1002/0470862106.ia339
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Electron‐Nuclear Double Resonance (ENDOR) Spectroscopy

Abstract: Electron‐nuclear double resonance (ENDOR) spectroscopy is a magnetic resonance technique that was invented in the mid 1950s by George Feher, then at Bell Telephone Laboratories. The first applications of ENDOR were to problems in solid state physics, but beginning in the 1970s, and particularly since the late 1980s, ENDOR has been widely applied to bioinorganic systems. ENDOR is fundamentally an electron paramagnetic resonance (EPR) technique, however, it also has aspects of nuclear magnetic resonance (NMR) sp… Show more

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Cited by 3 publications
(35 citation statements)
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“…From the naturally abundant nuclei in the LaOCl matrix, only 139 La have I = 7/2. ENDOR spectra, in general, are determined by the relative magnitude of HF and nuclear Zeeman interactions [73]. The fact that we observe the ENDOR signal at A/2 ≈ 16 MHz implies that our case corresponds to a Larmor-split HF-centered doublet.…”
Section: Resultsmentioning
confidence: 63%
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“…From the naturally abundant nuclei in the LaOCl matrix, only 139 La have I = 7/2. ENDOR spectra, in general, are determined by the relative magnitude of HF and nuclear Zeeman interactions [73]. The fact that we observe the ENDOR signal at A/2 ≈ 16 MHz implies that our case corresponds to a Larmor-split HF-centered doublet.…”
Section: Resultsmentioning
confidence: 63%
“…where g is the g-factor; µ B -the Bohr magneton; B-external magnetic field; A-the HF coupling tensor with components A [73]. The fact that we observe the ENDOR signal at A/2 ≈ 16 MHz implies that our case corresponds to a Larmor-split HF-centered doublet.…”
Section: Resultsmentioning
confidence: 64%
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“…This also explains why ENDOR spectra recorded along g x and g z are relatively broad, while at the two outer canonical orientations, g x and g z , ENDOR spectra often exhibit quite narrow, single-crystal type lines. The first-order resonance condition for ENDOR spectroscopy of 15 N nuclei is ν ENDOR =|ν 15N ± A/2|, where ν 15N is the Larmor frequency of a "free" 15 N nucleus and A is the hyperfine coupling [51][52][53]64]. For comparison of 15 N hyperfine couplings with those of the naturally occurring 14 N nucleus (I = 1, 99.6% abundance), the hyperfine couplings need to be scaled with 14 N/ 15 N gyromagnetic ratio of ≈1/1.40.…”
Section: Electronic Structure Of the Cation Radical Of The Primary Donor P 700 +mentioning
confidence: 99%
“…IspH contains a [4Fe-4S] cluster in its active site, and multiple cluster-based paramagnetic species of uncertain redox and ligation states can be detected after incubation with reductant, addition of a ligand, or during catalysis. To characterize the clusters in these species, 57 Fe-labeled samples of IspH were prepared and studied by electron paramagnetic resonance (EPR), 57 Fe electron−nuclear double resonance (ENDOR), and Mossbauer spectroscopies. Notably, this ENDOR study provides a rarely reported, complete determination of the 57 Fe hyperfine tensors for all four Fe ions in a [4Fe-4S] cluster.…”
mentioning
confidence: 99%