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Analysis of Ground-State Zero-Field Splitting for Mn^(2+) in ZnNbOF_(5)·6(H_(2)O) and CoNbOF_(5)·6(H_(2)O)

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Chinese Physics Letters 2011年第6期28卷 245-247页

作者： LI Ju-Fen KUANG Xiao-Yu School of Science Southwest Petroleum UniversityChengdu 610065 Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065 International Centre for Materials Physics Chinese Academy of SciencesShenyang 110016

The electron paramagnetic resonance spectra of trigonal Mn^(2+)centers in ZnNbOF_(5)·6(H_(2)O)and CoNbOF_(5)·6(H_(2)O)crystals are studied on the basis of the complete energy matrices for a d5 configuration ion in a trigonal ligand *** is demonstrated that the local lattice structure around a trigonal Mn2+center has an elongation distortion along the crystalline c3 axis,and when Mn2+is doped in the ZnNbOF_(5)·6(H_(2)O)and CoNbOF_(5)·6(H_(2)O)crystals,there is a similar local *** the EPR calculation,the local lattice structure parameters for trigonal Mn2+centers in ZnNbOF_(5)·6(H_(2)O)and CoNbOF_(5)·6(H_(2)O)are determined.

关键词： field trigonal centers

Coordination field analysis of Eu^(3+) ion doped into crystalline LaAlO_3: Eu

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Chinese Science Bulletin 1995年第12期40卷 1002-1006页

作者：范英芳潘大丰杨频 Institute of Molecular Science Shanxi University Taiyuan 030006 China

Lanthanum aluminate, LaAlO3, has been the subject of crystallographic studies and ithas been concluded that rhombohedric perovskite belongs to the space group *** studies have confirmed that the number of lines observ... 详细信息

关键词： trigonal field rare earth complex ligand field theory spectral analysis.

THE SYNTHESIS AND CRYSTAL STRUCTURE OF A NOVEL MOLYBDENUM-SULFUR CLUSTER COMPLEX, （NH4）4[Mo3（NO）4S13]·3H2O

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中国科学B辑(英文版) 1984年第7期27卷 657-664页

作者：汤卡罗金祥林唐有祺 The Laboratory for Structure of Matter Institute of Physical Chemistry Peking University Peking University

The title compound has been synthesized, the crystal structure of which has been detorminedby the single-crystal X-ray diffraction method. The crystal belongs to triclinic space group C-P1 with the unit cell parameters: a =9.535（2）A, b = 9.740（2）A, c = 15.795（4）A, α = 89.85（2）°, β = 91.80（2）°, γ = 99.37（1）°,ν = 1446.6A3, Ζ = 2. The structure is refined to R = 0.075, Rw = 0.074 for 1903 reflections. There are diverse bonding modes of molybdenum and sulfur in this eompound. The twosulfur atoms at the center bond to three molybdenum atoms from respective sides and formthe two apices of a trigonal bipyramid. Besides, there are S2-2 ligands and a polysulfur chaincomposed of three sulfur atoms. The coordination number for the three molybdenum atomsis seven. Their coordination polyhedra are somewhat distorted pentagonal bipyramid. Eachof the three NO ligands coordinated to molybdenum gives a linear group of Mo-N-O, whilethe fourth NO ligund bonded with a polysulfur chain forms a bent group of S-N

关键词： triclinic belongs molybdenum coordinated distorted Mo3 NH4 NO bonding trigonal

AN EMPIRICAL FORMULA FOR CALCULATING WORK FUNCTION OF ELEMENTS

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Chinese Science Bulletin 1992年第4期37卷 343-344页

作者：舒元梯 Department of Chemistry Leshan Teachers' College Leshan 614000 PRC

Work function of an element is an important measure for inquiring into the physical properties of crystals. It is concerned with not only the properties of the element itself, number and distribution of outermost elec... 详细信息

关键词： concerned itself cubic covalent hexagonal orbital tetragonal diamond trigonal agree

Lifshitz Transition Including Many-Body Effects in Bi-Layer Graphene and Change in Stacking Order

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Graphene 2013年第2期2卷 88-95页

作者： Partha Goswami Physics Department D.B. College University of Delhi New Delhi India

We consider the AB-(Bernal) stacking for the bi-layer graphene (BLG) system and assume that a perpendicular electric field is created by the external gates deposited on the BLG surface. In the basis (A1, B2, A2, B1) for the valleyKand the basis (B2, A1, B1, A2) for the valley K′, we show the occurrence of trigonal warping [1], that is, splitting of the energy bands or the density of states on the kx - ky plane into four pockets comprising of the central part and three legs due to a (skew) interlayer hopping between A1 and B2. The hopping between A1 - B2 leads to a concurrent velocity v3 in addition to the Fermi velocity vF. Our noteworthy outcome is that the above-mentioned topological change, referred to as the Lifshitz transition [2, 3], is entirely bias-tunable. Furthermore, the many-body effects, which is known to yield logarithmic renormalizations [4] in the band dispersions of monolayer graphene, is found to have significant effect on the bias-tunability of this transition. We also consider a variant of the system where the A atoms of the two layers are over each other and the B atoms of the layers are displaced with respect to each other. The Fermi energy density of statesfor zero bias corresponds to the inverted sombrero-like structure. The structure is found to get deformed due to the increase in the bias.

关键词： AB-(Bernal) Stacking trigonal Warping Lifshitz Transition Logarithmic Renormalizations Inverted Sombrero

EDESR and ODMR of Impurity Centers in Nanostructures Inserted in Silicon Microcavities

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Journal of Modern Physics 2011年第6期2卷 544-558页

作者： Nikolay T Bagraev Vladimir A. Mashkov Edward Yu Danilovsky Wolfgang Gehlhoff Dmitrii S. Gets Leonid E Klyachkin Andrei A Kudryavtsev Roman V. Kuzmin Anna M Malyarenko Vladimir V Romanov 不详

We present the first findings of the new electrically- and optically-detected magnetic resonance technique [ED electron spin resonance (EDESR) and (ODMR)] which reveal single point defects in the ultra-narrow silicon quantum wells (Si-QW) confined by the superconductor δ-barriers. This technique allows the ESR identification without the application of the external cavity as well as a high frequency source and recorder, with measuring the only magnetoresistance (EDESR) and transmission (ODMR) spectra within frameworks of the excitonic normal-mode coupling (NMC) caused by the microcavities embedded in the Si-QW plane. The new resonant positive magnetoresistance data are interpreted here in terms of the interference transition in the diffusive transport of free holes respectively between the weak antilocalization regime in the region far from the ESR of a paramagnetic point defect located inside or near the conductive channel and the weak localization regime in the nearest region of the ESR of that defect.

关键词： Silicon Microcavity Quantum Well ESR Bound Exciton trigonal Centers Single Centers Carbon ODMR

DETERMINATION OF X-RAY POWDER DIFFRACTION DATA OF LiTaO_3

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Chinese Science Bulletin 1980年第10期25卷 856-857页

作者：郭常霖 Shanghai Institute of Ceramics Academia Sinica

The single crystal of LiTaO3 is an important ferro-electric crystal, pcssessing comparatively better electro-optic, piezo-electric and thermo-electrio properties. It has been put widely into *** X-ray powder diffracti... 详细信息

关键词： ferro neutron optic Abraham thermo hexagonal trigonal milling pressing purity

MSSBAUER SPECTROSCOPIC STUDY OF Fe-S CLUSTER COMPLEX FORMED BY Fe AND THE TRYPSIN INHIBITOR FROM MUNG BEAN

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Chinese Science Bulletin 1983年第4期28卷 539-542页

作者：张毓昌朱德煦朱念周钱可萍余保元 Department of Physics Nanjing University Department of Biology Nanjing University Department of Chemistry Nanjing University Department of Chemistry Nanjing Universityhere are two classes of proteins containing iron in the organism. One is heme iron protein such as hemoglobin myoglobin xanthine oxidases cytochromes etc. These proteins are those in which iron atoms are bound to porphyrin. The other class is non-heme iron protein. One of this is the iron-sulfur protein in which iron atoms are bound to sulfur-containing ligands.

There are two classes of proteins containing iron in the organism. One is heme iron protein, such as hemoglobin, myoglobin, xanthine oxidases, cytochromes, etc. These proteins are those in which iron atoms are bound to porphyrin. The other class is non-heme iron protein. One of this is the iron-sulfur protein, in which iron atoms are bound to sulfur-containing ligands.

关键词： hemoglobin myoglobin xanthine sulfur porphyrin Proteins fitted bonds trigonal universal

CRYSTAL AND MOLECULAR STRUCTURE OF A TRIS-THIOUREA COMPLEX OF MOLYBDENUM(Ⅲ) CHLORIDE Mo[SC(NH_2)_2]_3Cl_3

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Chinese Science Bulletin 1981年第4期26卷 322-324页

作者：黄金陵林墀昌林连堂卢嘉锡 Fujian Institute of Research on the Structure of Matter Academia Sinica Fuzhou University

A series of thiourea complexes of molybdenum have been prepared by one of which is the rather stable MoCl3（Tu）3. On the basis of magnetic measurements, has proposed that in the complex the molybdenum （Ⅲ） atom has a configuration of octahedral coordination of six ligands. A complete structural investigation will obviously lead to a better understanding of the interesting complex.

关键词： octahedral complexes molybdenum thiourea CHLORIDE Mo[SC NH2 l3 trigonal bonds intramolecular