Парамагнитные ионы в легированном европием искаженном перовските YAlO-=SUB=-3-=/SUB=-

In yttrium orthoaluminate crystals doped with the 151Eu isotope, the paramagnetic centers Eu2+, Cr3+, Gd3+, and Mo3+ have been detected. The fine structure parameters of the spin Hamiltonian of these centers were determined or refined. The account of the orientational behavior of previously unobserved forbidden transitions has been taken for the Cr3+ centers. It is shown that two Mo3+ signals that are detected in magnetic fields parallel to the crystallographic axes do not belong to different molybdenum centers, but are two intra-doublet transitions of the same center.

Download Full-text

Cross‐Field Diffusion of Electrons in Tangled Magnetic Fields and Implications for Coronal Fine Structure

The Astrophysical Journal ◽

10.1086/504699 ◽

2006 ◽

Vol 646 (1) ◽

pp. 615-624 ◽

Cited By ~ 29

Author(s):

R. K. Galloway ◽

P. Helander ◽

A. L. MacKinnon

Keyword(s):

Fine Structure ◽

Magnetic Fields ◽

Field Diffusion

Download Full-text

Laboratory Stopped-Flow XAFS Apparatus. Structure Determination of the Short-Lived Peroxochromium Intermediate Formed during Reduction Process of Chromate(VI) Ion by Hydrogen Peroxide

Zeitschrift für Naturforschung B ◽

10.1515/znb-1997-0608 ◽

1997 ◽

Vol 52 (6) ◽

pp. 711-718 ◽

Cited By ~ 11

Author(s):

Y. Inada ◽

S. Funahashi

Keyword(s):

Hydrogen Peroxide ◽

Fine Structure ◽

Water Molecule ◽

Reduction Process ◽

Stopped Flow ◽

Structure Parameters ◽

X Ray ◽

Reaction Intermediate ◽

X Ray Absorption

In order to determine the structure parameters of the reaction intermediate formed during the reduction process of chromate(VI) ion by hydrogen peroxide, a laboratory stopped-flow X-ray absorption fine structure (XAFS ) apparatus, which was constructed by a rotating anode X-ray generator, an energy scanning spectrometer, a stopped-flow assembly, and X-ray detectors, was newly developed. Using the apparatus, the Cr K -edge XAFS spectrum of the reaction intermediate was measured. One oxo group, two peroxo groups, and one water molecule are coordinated to the Cr(VI) center in the intermediate, CrO(O2)2(H2O ) , with Cr - O bond lengths of 157, 168, and 193 pm, respectively. The geometry around the Cr(VI) center is probably 6-coordinate pentagonal pyramidal.

Download Full-text

The Connection of Fine-Structure Photospheric Features in Active Regions with Magnetic Fields

Structure and Development of Solar Active Regions ◽

10.1007/978-94-011-6815-1_29 ◽

1968 ◽

pp. 201-201 ◽

Cited By ~ 1

Author(s):

N. V. Steshenko

Keyword(s):

Fine Structure ◽

Magnetic Fields ◽

Active Regions

Download Full-text

Fine structure of solar magnetic fields

Solar Physics ◽

10.1007/bf00145459 ◽

1972 ◽

Vol 22 (1) ◽

pp. 34-48 ◽

Cited By ~ 86

Author(s):

Harold Zirin

Keyword(s):

Fine Structure ◽

Magnetic Fields ◽

Solar Magnetic Fields

Download Full-text

Calculation of the fine-structure parameters for np 5 n′f configurations of rare-gas atoms

Optics and Spectroscopy ◽

10.1134/1.1335026 ◽

2000 ◽

Vol 89 (6) ◽

pp. 811-816 ◽

Cited By ~ 2

Author(s):

G. P. Anisimova ◽

E. L. Kapel’kina ◽

R. I. Semenov

Keyword(s):

Fine Structure ◽

Rare Gas ◽

Structure Parameters ◽

Rare Gas Atoms

Download Full-text

Correlation of Zero Field Splittings and Site Distortions V. Mn2+ in Cs2Zn3S4

Zeitschrift für Naturforschung A ◽

10.1515/zna-1983-0209 ◽

1983 ◽

Vol 38 (2) ◽

pp. 149-153 ◽

Cited By ~ 2

Author(s):

M. Heming ◽

G. Lehmann

Keyword(s):

Fine Structure ◽

Hyperfine Splitting ◽

Site Symmetry ◽

Zero Field ◽

Structure Parameters ◽

Zero Field Splitting ◽

Zero Field Splitting Parameter ◽

Free Ion ◽

Splitting Parameter ◽

Epr Signal

Abstract In platelets of Cs2Zn3S4 with about 4% of the Zn substituted by Mn two nonequivalent centers of isolated Mn2+ were observed in addition to a broad EPR signal near g = 2 which is assigned to clusters of interconnected MnS4 units. The fine structure and hyperfine structure parameters for the single-ion centers (all in units of 1CT 4 cm -1) areb02 = -318.3 ± 3; b22 = -210.3 ± 2; Ay = -62.7; Az = -63.6 ± 0.8;b02 = -890 ± 18; b22 = -743 ± 36; Ay = -60.6; Az = - 61.4 ± 0.8;for centers I and II, resp. Center II arises from Zn sites of C 2 site symmetry while for center I assignment to either one of two sites with D2 site symmetry is possible. The larger hyperfine splitting constants as well as the superposition analysis favor the larger sites which are not occupied by Zn, but are partly occupied in the analogous Mn (and Co) compounds. Superposition analysis yields the same value of + 0.12 ± 0.02 cm-1 for the intrinsic zero field splitting parameter b̄2 of the bridging MnS4 units in both sites. gz is significantly higher than the free ion value indicating a higher degree of covalency than in Cds and CdGa2S4.

Download Full-text