scholarly journals Особенности электронного парамагнитного резонанса примеси железа в кристаллах HgSe

2019 ◽  
Vol 53 (3) ◽  
pp. 317
Author(s):  
А.И. Вейнгер ◽  
И.В. Кочман ◽  
В.И. Окулов ◽  
Т.А. Говоркова ◽  
М.Д. Андрийчук ◽  
...  
Keyword(s):  
Fine Structure ◽  
Electron Spin Resonance ◽  
Curie Temperature ◽  
Electron Spin ◽  
Transition Metal Ions ◽  
Spectral Lines ◽  
Spin Resonance ◽  
Temperature Dependences ◽  
Ferromagnetic Ordering ◽  
Fine Structure Lines

AbstractThe electron-spin-resonance spectra of transition metal ions Fe in the HgSe matrix are analyzed. The spectra have an appearance typical of the Fe^3+ ion, i.e., they consist of five fine-structure lines with a splitting that corresponds to a weak crystal field. The spectra are observed at temperatures of up to 50 K. The spectral lines are deformed and have a Dyson shape. An analysis of the temperature dependences of the line amplitudes shows that a transition from paramagnetic ordering to ferromagnetic ordering occurs with decreasing temperature, with the Curie temperature T ≈ 7 K.

scholarly journals Поведение доноров фосфора в объемных монокристаллических моноизотопных сплавах -=SUP=-28-=/SUP=-Si-=SUB=-1-x-=/SUB=--=SUP=-72-=/SUP=-Ge-=SUB=-x-=/SUB=-

2020 ◽  
Vol 54 (9) ◽  
pp. 933
Author(s):  
А.А. Ежевский ◽  
П.Г. Сенников ◽  
Д.В. Гусейнов ◽  
А.В. Сухоруков ◽  
Е.А. Калинина ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Resonance Method ◽  
Relaxation Mechanism ◽  
Longitudinal Component ◽  
Bulk Single Crystal ◽  
Orbit Splitting ◽  
Spin Resonance ◽  
Temperature Dependences ◽  
Silicon And Germanium

Abstract The behavior of phosphorus donors in bulk single-crystal monoisotopic Si_1 – _ x Ge_ x alloys ( x = 0.0039–0.05) enriched by zero-spin isotopes ^28Si (99.998%) and ^72Ge (99.984%) by the electron-spin-resonance method is investigated. The hyperfine structure of the donor-electron spectrum giving information on the density of the donor wave function in the ground state on the ^31P nucleus ( I = 1/2) as well as the temperature dependences of the spin-relaxation rate ( T = 3.5–30 K), which make it possible to analyze the longitudinal component T _1 relaxation mechanism and magnitude of the valley–orbit splitting of the donor state, are investigated. Interest in these investigations is also caused by the fact that the Si_1 – _ x Ge_ x alloy enriched by zero-spin isotopes (^28Si^isoGe, iso = 70, 72, 74, 76) is a poorly known material when compared with ^28Si. The irregular arrangement of germanium atoms in the lattice of the SiGe solid solution and local distortions formed by it can level isotopic effects under isotopic enrichment. However, despite broadening of the lines of the electron-spin resonance of donor electrons due to random deformations formed by dissolved germanium atoms in silicon, narrower lines of the spectra of the electron-spin resonance are observed in isotopically pure Si_1 – _ x Ge_ x single crystals at x = 0.39, 1.2, 2.9 at % when compared with similar crystals with the natural composition of silicon and germanium isotopes.

SPIN ALIGNMENT BETWEEN THE TRIPLET EXCITED STATE OF PHENYLANTHRACENE AND THE DANGLING VERDAZYL RADICAL AS STUDIED BY TIME-RESOLVED ELECTRON SPIN RESONANCE

2001 ◽  
Vol 15 (28n30) ◽  
pp. 4029-4031 ◽  
Author(s):  
YOSHIO TEKI ◽  
MASAAKI NAKATSUJI ◽  
YOZO MIURA
Keyword(s):  
Fine Structure ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spectral Simulation ◽  
Spin Alignment ◽  
Time Resolved ◽  
Relative Population ◽  
Excited Triplet ◽  
Verdazyl Radical ◽  
Spin Resonance

The photo-excited quartet (S=3/2) high spin state of a radical-excited triplet pair of a novel compound, phenylanthracene-verdazyl radical, was detected by time-resolved electron spin resonance (TRESR) technique. The TRESR spectrum was well analyzed by the ordinary spin Hamiltonian with the Zeeman and fine-structure terms. The g value, fine-structure splitting, and relative population of the Ms sublevels have been determined to be g=2.0043, D=0.0230 cm -1, E=0.0 cm -1 and P1/2′=P-12′=0.5 and P3/2′=P-3/2′=0.0, respectively, by the spectral simulation. The direct observation of the excited quartet state shows tha the photo-induced intramolecular spin alignment is realized between the excited triplet state (S=1) of the phenylanthracene moiety and the doublet spin (S=1/2) of the dangling verdazyl radical.

Electron-spin resonance of Gd in LaNi5single crystals: Resolved fine structure in hexagonal host and the role of random strains

1979 ◽  
Vol 20 (7) ◽  
pp. 2624-2633 ◽  
Author(s):  
R. Levin ◽  
A. Grayevskey ◽  
D. Shaltiel ◽  
V. Zevin ◽  
D. Davidov
Keyword(s):  
Fine Structure ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Resonance

scholarly journals Electron Spin Resonance (ESR) in detection of aquatic pollution through host-parasite relationship

2018 ◽  
Vol 13 (6) ◽  
pp. 1
Author(s):  
Lucas Aparecido Rosa Leite ◽  
Angela Kinoshita ◽  
Oswaldo Baffa ◽  
Rodney Kozlowiski de Azevedo ◽  
Vanessa Doro Abdallah
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Limit Of Detection ◽  
Total Concentration ◽  
Transition Metal Ions ◽  
Resonance Spectroscopy ◽  
Prochilodus Lineatus ◽  
Water And Sediment ◽  
Spin Resonance ◽  
Parasite Relationship

Aquatic environmental pollution due to negative human activities remains a major problem. Bioindicators that primarily describe the total concentration of the respective pollutant are very useful tools to aid in the chemical analysis of water in order to obtain knowledge about the levels of pollutants in the environment. This study therefore used Electron Spin Resonance Spectroscopy (ESR) to detect the presence of transition metals (copper, iron and manganese) and possible radicals present in samples of Neoechinorhynchus curemai and its host tissues Prochilodus lineatus, as well in water and sediment of the Batalha River, at the same sample site where fish were collected. Spectral analysis of samples showed the presence of three metals (Cu2+, Fe3+ and Mn2+), in addition to nitric oxide (NO) and humic acid (HA). Quantification of the elements in the samples was possible only for Cu detected in the spectrum of parasites, which was equivalent to 2 ppm. ESR proved to be efficient in the detection of transition-metal ions (Cu2+, Fe3+ and Mn2+), in addition to NO and HA. However, the low concentration values of these compounds in P. lineatus tissues (liver, muscle and intestine) and in the water and sediment samples collected did not allow their quantification, as they were below the limit of detection. It can be concluded that N. curemai had the capacity to accumulate these ions, especially copper.

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