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Article
Submillimetre EPR spectrometer
A wide-band submillimetre EPR spectrometer is described. A set of tunable backward wave oscillators and quasioptic lens system enables one to operate in the frequency region 79–535 GHz. The sample is placed in...
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Article
Submillimeter electron-nuclear excitation spectra in CsCdBr3:Ln3+ (Ln=Tm, Ho) crystals
The ESR spectra of single and pair impurity centers of thulium and holmium ions in CsCdBr3:Tm3+ and CsCdBr3:Ho3+ crystals are measured in the frequency range 160-400 GHz. Analysis of the characteristic features o...
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Article
Hyperfine structure of submillimeter EPR spectra of non-Kramers lanthanide ions in crystals
The hyperfine structures of submillimeter EPR spectra of CsCdBr3:Tm3+ and CaF2:Dy2+ single crystals have been resolved and analyzed. The crystal field parameters and the magnetic hyperfine constants are obtained ...
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Article
High-frequency tunable EPR spectroscopy of Cr3+ in synthetic forsterite
The electron paramagnetic resonance spectra of isolated and dimer impurity centers of trivalent chromium ions in the octahedral Ml sites in synthetic forsterite are studied in the frequency range of 65–90 GHz....
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Article
Jahn-teller chromium ions in CdF2 and CaF2 crystals: An EPR spectroscopic study in the frequency range 9.3–300 GHz
The bivalent chromium impurity centers in CdF2 and CaF2 crystals are investigated using electron paramagnetic resonance (EPR) in the frequency range 9.3–300 GHz. It is found that Cr2+ ions in the lattices of thes...
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Article
High-frequency EPR of Cr2+ ions in CdGa2S4
High-frequency broad-band (65–240 GHz) EPR is used to study impurity centers of bivalent chromium in a CdGa2S4 crystal. It is found that the EPR spectra correspond to tetragonal symmetry. The spin Hamiltonian H =...
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Article
High-frequency EPR of Tb3+-doped KPb2Cl5 crystal
High-frequency electron paramagnetic resonance (EPR) spectra of the KPb2Cl5:Tb3+ crystal have been investigated. Three types of spectra were observed in the frequency range of 74–200 GHz. The most intensive spect...
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Article
Electron paramagnetic resonance study of Fe3+ ions at octahedral and tetrahedral mirror symmetry sites in the LiScGeO4 crystal
An electron paramagnetic resonance (EPR) study of a synthetic single crystal of LiScGeO4 doped with Cr ions carried out earlier at the X- and Q-bands at 300, K has indicated additional weak lines. A detailed anal...
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Article
Crystal fields of hexameric rare-earth clusters in fluorites
In solid solutions of alkaline-and rare-earth fluorides with a fluorite structure, ions of most elements of the rare-earth (RE) row form hexameric clusters that assimilate the minor component of the solid solu...
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Article
Direct measurements of anticrossings of the electron-nuclear energy levels in LiYF4∶Ho3+ with submillimeter EPR spectroscopy
The electron paramagnetic resonance (EPR) spectra of impurity Ho3+ ions in monocrystals LiYF4∶Ho3+ (0.1 and 1%) with the natural abundance of6Li (7.42%) and7Li (92.58%) isotopes, and in the sample7LiYF4∶Ho3+ (0.1...
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Article
Low-energy excited states of 3d transition metal ions in zinc selenide
The results of studying the impurity heat capacity of Zn1−x M xSe (M = Cr2+, Fe2+, Ni2+, Mn2+) solid solutions in the temperature range 1.8...
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Article
Multi-range high-frequency EPR spectroscopy of LiYF4 and LiLuF4 crystals doped by rare-earth ions
EPR spectra of isostructural LiYF4 and LiLuF4 crystals doped by Dy3+, Er3+, and Ho3+ ions are measured at 4.2 K in the frequency range 40–800 GHz. The effects caused by isotopic disorder in the lithium sublattice...
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Article
High-frequency tunable EPR spectroscopy of non-Kramers ions in AgGaSe2: Cr, AgGaS2: Cr, and CdGa2S4: Cr crystals
Crystals of the chalcopyrite family, AgGaSe2, AgGaS2, and CdGa2S4, doped with chromium ions have been investigated using high-frequency broad-band EPR spectroscopy in the range 65–530 GHz at T = 4.2 K. It has bee...
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Article
High-Frequency Tunable EPR of Fe2+ in the Natural and Synthetic Forsterite
The natural forsterites and their synthetic analogs were investigated on a wide-band EPR spectrometer in the frequency region of 65–850 GHz. Two types of non-Kramers ions Fe2+ were discovered at the site M1 (inve...
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Article
Wide-band EPR spectroscopy of YAlO3: Tm3+ single crystals
The YAlO3: Tm3+ single crystal has been studied on a wide-band EPR spectrometer. The EPR spectra of Tm3+ ions in the frequency range of 90–160 GHz have been detected for the first time. It has been confirmed that...
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Article
Open AccessIncipient ferroelectricity of water molecules confined to nano-channels of beryl
Water is characterized by large molecular electric dipole moments and strong interactions between molecules; however, hydrogen bonds screen the dipole–dipole coupling and suppress the ferroelectric order. The ...
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Article
Paramagnetic resonance of yttrium aluminum garnet doped with 151Eu2+ ions
The 151Eu2+ orthorhombic centers in yttrium aluminum garnet crystals have been investigated. The initial splitting and hyperfine interaction parameters have been obtained taking into account the positions of the ...
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Article
Submillimeter ESR spectra of Fe2+ ions in synthetic and natural beryl crystals
Electron spin resonance spectra of non-Kramers bivalent iron (Fe2+) ions have been detected in synthetic and natural beryl crystals with an iron impurity. The observed ESR spectra have been attributed to resonanc...
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Article
Paramagnetic defects in ZnSe crystals doped with iron ions
The electron paramagnetic resonance (EPR) spectra of iron-doped ZnSe single crystals were studied. In addition to cubic Fe3+ and Mn2+ centers and also Fe2+, and Cr2+ centers, monoclinic Fe3+ complexes locally com...
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Article
Wideband EPR Spectroscopy of Mo3+ Ions in Yttrium–Aluminum Garnet
The crystals of yttrium–aluminum garnet with an admixture of iron and cerium have been studied by the method of wideband EPR spectroscopy. Resonance absorption of microwave radiation in the frequency range 220...
