Foundations of Modern EPR 1998
DOI: 10.1142/9789812816764_0052
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Applications of Electron Spin Echo Modulation

Abstract: Electron spin echoes are a consequence of particular resonance microwave pulse sequences in pulsed electron spin resonance (ESR) experiments. The pulse sequences reorient the electron magnetic dipoles such that they dephase and then rephase to reform a macroscopic magnetic moment which is detected as a burst of microwave energy called an echo. Spin echoes were first discovered for nuclear spins in early nuclear magnetic resonance experiments by Hahn while a graduate student at the University of Illinois in 195… Show more

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Cited by 4 publications
(7 citation statements)
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“…The two-pulse frequency-domain spectra in Figure c clearly show the bound histidine ∼5 MHz peak (labeled *), a smaller positive feature at ∼2 MHz (labeled #), as well as a negative feature at ∼7 MHz. This negative feature may be a combination peak because two-pulse ESEEM spectra contain modulation frequencies that are combinations of the sums and differences of fundamental frequencies . The dominant peak at 15 MHz, present in Figure c, is due to weakly coupled protons.…”
Section: Resultsmentioning
confidence: 95%
“…The two-pulse frequency-domain spectra in Figure c clearly show the bound histidine ∼5 MHz peak (labeled *), a smaller positive feature at ∼2 MHz (labeled #), as well as a negative feature at ∼7 MHz. This negative feature may be a combination peak because two-pulse ESEEM spectra contain modulation frequencies that are combinations of the sums and differences of fundamental frequencies . The dominant peak at 15 MHz, present in Figure c, is due to weakly coupled protons.…”
Section: Resultsmentioning
confidence: 95%
“…The ESE signals were measured by using π/2−π two-pulse sequences. The periodic modulation on the envelope signals, ESEEM, arises from magnetic interactions between the unpaired electron of the neopentyl or ethyl radicals and the deuterons of perdeuterated matrix neopentane molecules. Large magnetic interactions such as hyperfine couplings of α- or β-protons in ethyl or neopentyl radicals are not detectable in ESEEM spectra. , Simulations of the ESEEM spectra were done by the second-order perturbation theory described elsewhere. The parameters for the simulation are summarized in Table . The periodic modulation on the envelope signals can be expressed as a function of the distances between the unpaired electron and surrounding matrix deuterons and the number of matrix deuterons.…”
Section: Resultsmentioning
confidence: 99%
“…The electron spin−echo (ESE) signals of neo-C 5 D 12 (98%)−C 2 H 6 (2%) mixture X-ray-irradiated at 4 or 77 K were measured with a X-band JEOL JES-PX1050 pulse-ESR spectrometer in Advanced Science Research Center of Japan Atomic Energy Research Institute at the temperature range 4−50 K. The ESE signals were observed by the π/2−π two-pulse sequences. …”
Section: Methodsmentioning
confidence: 99%
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“…ESEEM is a pulsed EPR technique that measures relatively weak magnetic coupling between an electron spin, here the one associated with the S 2 -state multiline signal of the Mn cluster, and nuclear spins of nearby ligand atoms out to a distance of ca. 5 Å. Three-pulse ESEEM utilizes a pulse sequence that leads to formation of a “stimulated” spin echo; unlike its two-pulse counterpart, this technique offers the advantage to suppress the modulation effect of an unwanted class of nuclei ( , ). We also performed a refined EXAFS analysis, using an improved technology compared to that of Cole et al (), to detect possible changes of the Mn cluster structure in the absence of the 33 kDa protein.…”
mentioning
confidence: 99%