Results 1 to 10 of about 5,046,560 (290)

High-Field (3.4 T) Electron Paramagnetic Resonance, ¹H Electron-Nuclear Double Resonance, ESEEM, HYSCORE, and Relaxation Studies of Asphaltene Solubility Fractions of Bitumen for Structural Characterization of Intrinsic Carbon-Centered Radicals [PDF]

Nanomaterials, 2022
Petroleum asphaltenes are considered the most irritating components of various oil systems, complicating the extraction, transportation, and processing of hydrocarbons. Despite the fact that the paramagnetic properties of asphaltenes and their aggregates
Marat Gafurov, Yulia Ganeeva, Tatyana Yusupova, Fadis Murzakhanov, Georgy Mamin   +4 more
doaj   +2 more sources

Increased sensitivity in electron–nuclear double resonance spectroscopy with chirped radiofrequency pulses [PDF]

Magnetic Resonance
Electron–nuclear double resonance (ENDOR) spectroscopy is an EPR technique to detect the nuclear frequency spectra of hyperfine coupled nuclei close to paramagnetic centers, which have interactions that are not resolved in continuous wave EPR spectra and
J. Stropp, N. Wili, N. C. Nielsen, D. Klose   +3 more
doaj   +2 more sources

Electron-nuclear double resonance. [PDF]

Photosynth Res, 2009
The application of electron-nuclear double resonance (ENDOR) spectroscopy for the investigation of photosynthetic systems is reviewed. The basic principles of continuous wave and pulse ENDOR are presented. Selected examples of the application of the ENDOR technique for studying stable and transient paramagnetic species, including cofactor radical ions,
Kulik L, Lubitz W.
europepmc   +4 more sources

High-Field EPR/ENDOR of N/Be Centers for Defect Engineering in 6H-SiC [PDF]

Nanomaterials
Silicon carbide (SiC) in its various structural modifications is widely used in power semiconductor electronics, operating under extreme conditions of high temperature, high voltage, and intense radiation.
Yuliya Ermakova, Ekaterina Dmitrieva, Margarita Sadovnikova, Fadis Murzakhanov, George Mamin, Sergey Nagalyuk, Evgeny Mokhov, Marat Gafurov   +7 more
doaj   +2 more sources

Structures of Impurity Defects in Lithium Niobate and Tantalate Derived from Electron Paramagnetic and Electron Nuclear Double Resonance Data

Crystals, 2021
Point intrinsic and extrinsic defects, especially paramagnetic ions of transition metals and rare-earth elements, have essential influence on properties of lithium niobate, LN and tantalate, LT, and often determine their suitability for numerous ...
Valentin G. Grachev, Galina I. Malovichko   +1 more
doaj   +3 more sources

Reverse dynamic nuclear polarisation for indirect detection of nuclear spins close to unpaired electrons [PDF]

Magnetic Resonance, 2022
Polarisation transfer schemes and indirect detection are central to magnetic resonance. Using the trityl radical OX063 and a pulse electron paramagnetic resonance spectrometer operating in the Q-band (35 GHz, 1.2 T), we show here that it is possible to ...
N. Wili, J. H. Ardenkjær-Larsen, G. Jeschke   +2 more
doaj   +1 more source

A primer in pulse EPR-based hyperfine spectroscopy for NMR spectroscopists

Journal of Magnetic Resonance Open, 2023
The theoretical foundations of NMR and EPR are very similar. Nevertheless, the fields differ significantly in practical aspects. This primer is an attempt to bridge some of the gaps between the fields, and at the same time it highlights some applications
Nino Wili
doaj   +1 more source

Radiation-Induced Stable Radicals in Calcium Phosphates: Results of Multifrequency EPR, EDNMR, ESEEM, and ENDOR Studies

Applied Sciences, 2021
This article presents the results of a study of radiation-induced defects in various synthetic calcium phosphate (CP) powder materials (hydroxyapatite—HA and octacalcium phosphate—OCP) by electron paramagnetic resonance (EPR) spectroscopy at the X, Q ...
Fadis F. Murzakhanov, Peter O. Grishin, Margarita A. Goldberg, Boris V. Yavkin, Georgy V. Mamin, Sergei B. Orlinskii, Alexander Yu. Fedotov, Natalia V. Petrakova, Andris Antuzevics, Marat R. Gafurov, Vladimir S. Komlev   +10 more
doaj   +1 more source

Electron-nuclear double resonance of interstitial chromium in silicon [PDF]

Physical Review B, 1987
The positively charged state of interstitial chromium in silicon was investigated using electron-nuclear double resonance. We have found the hyperfine interaction of the impurity electrons with nine shells of surrounding silicon neighbors containing 102 atoms.
van Kemp, R., Sieverts, E.G., Ammerlaan, C.A.J.   +2 more
openaire   +3 more sources

Pulsed Electron‐Nuclear Double Resonance in the Fourier Regime

ChemPhysChem, 2022
AbstractNuclear magnetic resonance (NMR) spectroscopy provides atomic‐level molecular structural information. However, in molecules containing unpaired electron spins, NMR signals are difficult to measure directly. In such cases, data is obtained using the electron‐nuclear double resonance (ENDOR) method, where nuclei are detected through their ...
Nir Dayan, Yaron Artzi, Moamen Jbara, David Cristea, Aharon Blank   +4 more
openaire   +2 more sources