EPR Study of Mn2+ in Hg(ClO4)2 · 6H2O Single Crystals

1980 ◽  
Vol 35 (12) ◽  
pp. 1304-1307 ◽  
Author(s):  
Viraal Kuraar Jain
Keyword(s):  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Hyperfine Transitions ◽  
Axial Part ◽  
X Band ◽  
Quadrupole Coupling ◽  
Electron Paramagnetic ◽  
Good Agreement

Abstract The electron paramagnetic resonance of Mn2+ in Hg(ClO4)2 · 6H2O has been studied at X-band at 298 K and 77 K. Mn2+ is found to substitute Hg 2+ . The spectra have been analysed using the spin-Hamiltonian appropriate for trigonal symmetry. From the unequal separations between the Δm = ± 1 doublets in M = + 1/2 → - 1/2 transitions, the value of the axial part of the quadrupole coupling constant is determined. The observed doublet separations of forbidden hyperfine transitions in M = + 1/2 → - 1/2 are in good agreement with those cal-culated.

Paramagnetische Resonanz von Mn++-Ionen in synthetischen und natürlichen ZnO-Kristallen (II). Analyse der verbotenen Übergänge ΔΜ = ±1, Δm= ±1

1962 ◽  
Vol 17 (8) ◽  
pp. 651-654 ◽  
Author(s):  
Jürgen Schneider ◽  
Subhas Ranjan Sircar
Keyword(s):  
Single Crystals ◽  
Quadrupole Coupling Constant ◽  
Epr Spectra ◽  
Coupling Constant ◽  
Third Order ◽  
Hyperfine Transitions ◽  
X Band ◽  
Quadrupole Coupling

Forbidden hyperfine transitions △M = ± 1, △m= ± 1, ± 2 have been observed at X-band frequencies in the epr-spectra of Mn++-ions in ZnO single crystals. From the unequal separation between the M= - ½ → ½, △m= ± 1 transitions in the spectrum, a quadrupole coupling constant of P=0,000016 ± 0,000002 cm-1 was obtained. Third order corrections to the hfs-energy had to be used in this analysis

Gas-phase electron paramagnetic resonance spectrum and dipole moment of NF( 1 ∆)

1973 ◽  
Vol 332 (1590) ◽  
pp. 355-363 ◽  
Keyword(s):  
Dipole Moment ◽  
Gas Phase ◽  
Resonance Spectrum ◽  
Rotational Level ◽  
Quadrupole Coupling Constant ◽  
Rotational Constant ◽  
Coupling Constants ◽  
Paramagnetic Resonance ◽  
Quadrupole Coupling ◽  
Electron Paramagnetic

The gas-phase paramagnetic resonance spectrum of NF in the J = 2 rotational level of the 1 ∆ state has been studied, and the dipole moment in this state is found to be 0.37 ± 0.60D. The rotational constant previously determined from the electronic spectrum is shown to be consistent with the electron resonance results, and the 14 N quadrupole coupling constant e 2 qQ is 4.1 ± 0.2 MHz. The hyperfine coupling constants of the 14 N and 19 F nuclei are + 109.92 ± 0.14 and +758.06 ± 0.23 MHz respectively.

Powder Zeeman NQR Study on 123Sb in Sb(C6H5)3

2002 ◽  
Vol 57 (6-7) ◽  
pp. 304-306
Author(s):  
O. Ege ◽  
S. Maekawa ◽  
H. Negita
Keyword(s):  
Computer Simulation ◽  
Line Shape ◽  
Asymmetry Parameter ◽  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Line Shapes ◽  
Quadrupole Coupling ◽  
Saddle Type ◽  
Lower Series ◽  
Good Agreement

Powder Zeeman NQR spectra of 123Sb in Sb(C6H5)3 were studied by means of a computer simulation and an experiment. The 123Sb nucleus has spin 7/2. There are two non-equivalent 123Sb atoms in the crystal of Sb(C6H5)3, so that there are two series of three transition lines (higher series: ν1h, ν2h, ν3h; lower series: ν11, ν21, v31). The powder Zeeman spectra for ν1h, based on the transition between the levels mI = ±1/2 and ±3/2, were observed at 77 K under the two conditions that i) the oscillation coil and the static magnetic coil were set coaxially and parallel, and ii) they were set perpendicular to each other. The powder line shapes for ν1h, which is the lowest line of the higher series due to 123Sb nuclei, were in good agreement with those from a computer simulation under the conditions i) and ii), showing that the asymmetry parameter of the field gradient is very small (η = 0). The line shape from i) exhibits two shoulders (saddle type), as it appeared for nuclear spin 5/2 and η = 0. The quadrupole coupling constant for 1h, calculated from the resonance frequency 47.820 MHz and the observed η, is 669.480 MHz at 77 K.

EPR Studies of Mn2+-Doped Diammonium Hexaaqua Magnesium(II) Sulfate

2006 ◽  
Vol 61 (12) ◽  
pp. 683-687 ◽  
Author(s):  
Ram Kripal ◽  
Ashutosh Kumar Shukla
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Single Crystals ◽  
Room Temperature ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Electron paramagnetic resonance (EPR) studies of Mn2+ impurity in single crystals of diammonium hexaaqua magnesium(II) sulfate have been carried out at 9.3 GHz (X-band) at room temperature. The EPR spectra exhibit a group of five fine structure transitions. The spin-Hamiltonian parameters were determined. Mn2+ enters the lattice interstitially. The EPR spectrum of a powder sample supports the data obtained by single crystal studies. - PACS number: 76.30

ELECTRON PARAMAGNETIC RESONANCE EXPERIMENTS WITH Ti3+ IONS IN RbAl(SO4)2 ∙ 12H2O

1964 ◽  
Vol 42 (12) ◽  
pp. 2419-2428 ◽  
Author(s):  
Gerald F. Dionne
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Resonance Spectrum ◽  
Point Group ◽  
Orthorhombic Symmetry ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Crystal Electric Field ◽  
Microwave Spectrometer ◽  
X Band ◽  
Electron Paramagnetic

The paramagnetic resonance spectrum of the Ti3+ ion in cubic RbAl(SO4)2 ∙ 12H2O single crystals has been studied in the {100} and {110} planes at 4.2 °K with an X-band microwave spectrometer. The spectrum, which consists of a maximum of 12 lines, has been explained by considering a model of 12 magnetic complexes which are related to each other through the symmetry elements of the Th = (2/m)3 point group of the Rb alum lattice. For the spin Hamiltonian with [Formula: see text], three g factors have been determined—1.895, 1.715, and 1.767— within an accuracy of ±0.002, indicating the existence of a crystal electric field of orthorhombic symmetry.

EPR Studies of Tb 4+ in Single Crystals of Zircon and Scheelite Structure Silicates and Germanates

1996 ◽  
Vol 51 (8) ◽  
pp. 885-894 ◽  
Author(s):  
S. Hansen ◽  
B. D. Mosel ◽  
W. Müller-Warmuth ◽  
P. E. Fielding
Keyword(s):  
Magnetic Field ◽  
Zero Field ◽  
Scheelite Structure ◽  
Spin Hamiltonian ◽  
Field Limit ◽  
Paramagnetic Resonance ◽  
Zircon Structure ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Abstract Electron paramagnetic resonance spectra of tetravalent terbium ions have been observed in host crystals of ZrSiO4 , HfSiO4 , ThSiO4 , ThGeO4 (zircon structure) and ZrGeO4 , HfGeO4 (scheelite structure) at X band and Q band and various temperatures. The spin Hamiltonian parameters have been determined from the rotational diagrams; the zero field splittings turned out to be extremely large, so that complex spectra far from the strong magnetic field limit had to be analyzed. In all the compounds Tb4+ substitutes for the tetragonal metal lattice sites. The incorporation of terbium, the origin of the large second-order parameters and comparisons with the spectra of trivalent gadolinium in similar systems are discussed.

Electron Paramagnetic Resonance of Ti3+ Ions in KAl(SO4)2∙12H2O

1975 ◽  
Vol 53 (8) ◽  
pp. 841-842 ◽  
Author(s):  
John A. MacKinnon ◽  
M. Shannon
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Resonance Spectrum ◽  
Point Group ◽  
Spin Hamiltonian ◽  
Potassium Alum ◽  
Paramagnetic Resonance ◽  
Microwave Spectrometer ◽  
X Band ◽  
Electron Paramagnetic

The paramagnetic resonance spectrum of Ti3+ ions in potassium alum (KAl(SO4)2∙12H2O) single crystals has been studied in the {100} planes at 4.2 K with an X band microwave spectrometer. The spectrum is an analogue of that reported by Dionne for Ti3+ ions in rubidium alum (RbAl(SO4)2∙12H2O) and by MacKinnon and Dionne for Ti3+ ions in the thallium alum (TlAl(SO4)2∙12H2O). The spectrum was explained with a model of 12 magnetic complexes, the complexes being related to each other through the symmetry elements of the [Formula: see text] point group of the alum lattice. The three g factors for the spin Hamiltonian with S = 1/2 were found to be 1.979, 1.898, and 1.828, with an accuracy of ±0.005.

The High Resolution Rotational Spectrum of Silylbromide, SiH381Br

1977 ◽  
Vol 32 (12) ◽  
pp. 1444-1449 ◽  
Author(s):  
K.-F. Dössel ◽  
D. H. Sutter
Keyword(s):  
High Resolution ◽  
Quadrupole Coupling Constant ◽  
Rotational Constant ◽  
Rotational Spectrum ◽  
Coupling Constant ◽  
Hyperfine Transitions ◽  
Quadrupole Coupling ◽  
Nuclear Shielding ◽  
Shielding Tensor ◽  
Centrifugal Distortion Constants

Abstract The microwave spectrum of SiH381Br has been reanalysed in the frequency range 8-40 GHz under high resolution. From 64 observed hyperfine transitions improved values for the rotational constant B = 4292646.2(4) kHz and the quadrupole coupling constant eqQ = 279825(5) kHz were obtained. Furthermore the centrifugal distortion constants DJ = 1.81(1) kHz and DJK = 29.19(4) kHz and the spin-rotation constants CN = -2.32(40) kHz and CK = -34.2(11) kHz were determined. From the values of CN and CK the 81Br nuclear shielding tensor is calculated. An improved value of ∣μ∣ - 1.319(8) D is given for the molecular electric dipole-moment.

Host Spin-Lattice Relaxation Narrowing in Pr2Co3(NO3)12 · 24 H2O: Mn2+ \ Gd3+ Single Crystals

1980 ◽  
Vol 35 (12) ◽  
pp. 1308-1312 ◽  
Author(s):  
Vimal Kumar Jain
Keyword(s):  
Single Crystals ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Single Type ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Abstract Electron paramagnetic resonance of Mn2+ and Gd3+ in single crystals of Pr2Co3(NO3)12 · 24 H2O has been studied at X-band at 305 and 77 K. Mn2+ substitutes at two types of Co2+ sites whereas Gd3 substitutes at the single type of Pr3+ site in the lattice. The spin-Hamiltonian parameters have been evaluated. Observation of resolved Mn2+ and Gd3+ spectra at 305 K and their broadening on lowering the temperature are discussed in terms of host spin-lattice relaxation narrowing.

Tetranuclear supramolecular structures containing phthalocyanine cores

2007 ◽  
Vol 11 (07) ◽  
pp. 531-536 ◽  
Author(s):  
Ibrahim Özçesmeci ◽  
Sadik Güner ◽  
Ali Ihsan Okur ◽  
Ahmet Gül
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Energy Levels ◽  
Water Soluble ◽  
Orbital Energy ◽  
Characteristic Line ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

A metal-free phthalocyanine with four pyridyl donor groups, bound through ethylthio ester bridges on the periphery, have been prepared. The pyridine donors were quaternized with iodomethane to a water-soluble tetracationic phthalocyanine. The tetranuclear supramolecular phthalocyanine was prepared by the coordination of peripheral pyridine donors with VO(acac)2. The paramagnetic tetranuclear structure was studied in powder and solution forms by the electron paramagnetic resonance (EPR) technique. Electron paramagnetic resonance studies, together with the other spectral data confirmed the presence of identical pyridine-coordinated VO(acac)2 paramagnetic centers attached to the peripheral positions of the phthalocyanine core. The X-band EPR signals recorded from powder and solution forms of supramolecules have a characteristic line shape that proves the presence of axial symmetry around the paramagnetic vanadium ions. The anisotropic Lande splitting factors were calculated as g ∥ < g ⊥ < g e = 2.0023. Orbital energy levels for magnetic electrons were determined from theoretically fitted Spin Hamiltonian parameters.

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