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energy spectrum, g Factors, Strain-Induced Level-Splittings and R-Line Thermal Shift of MgO:V^(2+)

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Communications in Theoretical Physics 2008年第8期50卷 511-516页

作者： ZHANG Zheng-Jie MA Dong-Ping Department of Physics Chengdu University of Technology Chengdu 610059 China Department of Applied Physics Sichuan University Chengdu 610065 China

Traditional ligand-field theory has to be improved by taking into account both pure electronic contribution and electron-phonon interaction one （including lattice-vibrational relaxation energy）. By means of improved ligand-field theory, the R line, t^322T1 and t^322T2 lines, t^22（^3T1）e^4T2, t^22（^3T1）e^4T1 and t2e^2（^4A2）4T1 bands, g factors of t^32 ^4A2 and t32E, four strain-induced level-splittings and R-line thermal shift of MgO：V^2＋ have been calculated. The results are in very good agreement with the experimental data. It is found that for MgO：V^2＋, the contributions due to electronphonon interaction （EPI） come from the first-order term; the contributions from the second-order and higher terms are insignificant. In thermal shift of R line of MgO：V^2＋, the temperature-dependent contribution due to EPI is dominant. The results obtained in this work may be used in theoretical calculations of other effects of EPI.

关键词： improved ligand-field theory electron-phonon interaction energy spectrum strain-induced split-ting thermal shift g factor

energy spectrum of cosmic protons and helium nuclei by a hybrid measurement at 4300 m a.s.l.

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Chinese Physics C 2014年第4期38卷 25-31页

作者： B.Bartoli P.Bernardini 毕效军 I.Bolognino P.Branchini A.Budano A.K.Calabrese Melcarne P.Camarri 曹臻 R.Cardarelli S.Catalanotti 陈松战陈天禄 P.Creti 崔树旺戴木忠 A.D'Amone 单增罗布 I.De Mitri B.D'Ettorre Piazzoli T.Di Girolamo G.Di Sciascio 冯存峰冯朝阳冯振勇苟全补郭义庆何会海胡海兵胡红波 M.Iacovacci R.Iuppa 贾焕玉拉巴次仁厉海金 G.Liguori 刘成刘俊刘茂元卢红马玲玲马欣华 G.Mancarella S.M.Mari G.Marsella D.Martello S.Mastroianni P.Montini C.C.Ning M.Panareo B.Panico L.Perrone P.Pistilli F.Ruggieri P.Salvini R.Santonico S.N.Sbano 沈培若盛向东石峰 A.Surdo 谭有恒 P.Vallania S.Vernetto C.Vigorito 王辉吴超勇吴含荣薛良杨群羽杨先楚姚志国袁爱芳查敏张慧敏张力张学尧张勇赵静扎西次仁扎西桑珠周勋秀祝凤荣朱清棋 G.Zizzi 白云翔陈明君陈垚冯少辉高博顾旻皓侯超李晓晓刘佳刘加丽王旭肖刚张丙开张寿山周斌左雄 Dipartimento di Fisica dell’Università di Napoli "Federico II" Complesso Universitario di Monte Sant’Angelovia Cinthia Istituto Nazionale di Fisica Nucleare Sezione di Napoli Complesso Universitario di Monte Sant’Angelovia Cinthia Dipartimento di Matematica e Fisica "Ennio De Giorgi" Università del Salento via per Arnesano Istituto Nazionale di Fisica Nucleare Sezione di Lecce via per Arnesano Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Dipartimento di Fisica dell’Università di Pavia via Bassi 627100 Pavia Italy Istituto Nazionale di Fisica Nucleare Sezione di Pavia via Bassi 627100 Pavia Italy Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre via della Vasca Navale 8400146 Roma Italy Istituto Nazionale di Fisica Nucleare-CNAF Viale Berti-Pichat 6/240127 Bologna Italy Dipartimento di Fisica dell’Università di Roma "Tor Vergata" via della Ricerca Scientifica Istituto Nazionale di Fisica Nucleare Sezione di Roma Tor Vergata via della Ricerca Scientifica Tibet University Hebei Normal University Yunnan University Shandong University Southwest Jiaotong University Dipartimento di Fisica dell’Università "Roma Tre" via della Vasca Navale 8400146 Roma Italy Osservatorio Astrofisico di Torino dell’Istituto Nazionale di Astrofisica via P.Giuria 110125 Torino Italy Istituto Nazionale di Fisica Nucleare Sezione di Torino via P.Giuria 110125 Torino Italy Dipartimento di Fisica dell’Università di Torino via P.Giuria 110125 Torino Italy Physics Department Kunming University Normal College of Fuyang

The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.

关键词： Cherenkov telescope ARGO-YBJ energy spectrum hybrid measurement composition

energy spectrum of YAG:Cr3+ and Thermal Shifts of Its R Lines

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Communications in Theoretical Physics 2005年第7期44卷 165-170页

作者： MA Dong--Ping CHEN Ju--Rong Department of Applied Physics, Sichuan University, Chengdu 610065, China International Centre for Materials Physics, the Chinese Academy of Sciences, Shenyang 110015, China Department of Applied Physics Sichuan University International Centre for Materials Physics the Chinese Academy of Sciences

Traditional ligand-field theory has to be improved bv taking into account both "pure electronic" contributionand electron-phonon interaction one （including lattice-vitbrational relaxation energv）. By means of improved ligand-fieldtheory, R1, R2, R3′, R2′, and R1′ lines, U band, ground-state zero-field-splitting （GSZFS） and ground-state g factors aswell as thermal shifts of R1line and R2line of YAG:Cr3+have been calculated. The results are in very good agreementwith the experimental data. In contrast with ruby, the octahedron of ligand oxygen ions surrounding the central Cr3+ion in YAG:Cr3+is compressed along the [111] direction. Thus, for YAG:Cr3+and ruby, the splitting of t23 4A2(or t23 2E)has opposite order, and the trigonal-field parameters of the two crystals have opposite signs. In thermal shifts of R1andR2lines of YAG:Cr3+, the tetnperature-dependent contributions due to EPI are dominant.

关键词： improved ligand-field theory electron-phonon interaction Stokes shift energy spectrum thermal shift g factor

energy spectrum of Two-Component Bose-Einstein Condensates in Optical Lattices

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Communications in Theoretical Physics 2005年第5期43卷 809-813页

作者： HANJiu-Rong LIUJin-Ming JINGHui WANGYu-Zhu LaboratoryforQuantumOptics ShanghaiInstituteofOpticsandFineMechanicsandCenterforColdAtomPhysicstheChineseAcademyofSciencesShanghai201800China DepartmentofPhysics YangzhouUniversityYangzhou225002China

With the method of Green's function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We End that there are two energy bands for each component. The critical condition of the superfluid-Mott insulator phase transition is determined by the energy band structure. We also find that the nearest neighboring and on-site interactions fail to change the structure of energy bands, but shift the energy bands only. According to the conditions of the phase transitions, three stable superfluid and Mott insulating phases can be found by adjusting the experiment parameters. We also discuss the possibility of observing these new phases and their transitions in further experiments.

关键词： energy spectrum phase transition Bose-Einstein condensates optical lattice

energy spectrum of a Positronium Negative Ion in a Parabolic Quantum Well

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Communications in Theoretical Physics 2002年第11期37卷 634-636页

作者： XIEWen－Fang DepartmentofPhysics GuangzhouUniversityGuangzhou510405China

The method of few-body physics is applied to calculating the energy levels of low-lying states ofa positro-nium negative ion in a parabolic quantum well. The results show that the energy levels of a positronium negati... 详细信息

关键词： (e(-)e(-)e(+)) system energy spectrum

energy spectrum of Ground State and Excitation spectrum of Quasi-particle for Hard-Core Boson in Optical Lattices

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Communications in Theoretical Physics 2005年第5X期44卷 863-866页

作者： HAN Jiu-Rong ZHANG Hai-Chao WANG Yu-Zhu Department of Physics Yangzhou University Yangzhou 225002 China Laboratory of Quantum Optics Shanghai Institute of Optics and Fine Mechanics the Chinese Academy of Sciences Shanghai 201800 China

We investigate the energy spectrum of ground state and quasi-particle excitation spectrum of hard-core bosons, which behave very much like spinless noninteracting ferrnions, in optical lattices by means of the perturbation expansion and Bogoliubov approach. The results show that the energy spectrum has a single band structure, and the energy is lower near zero momentum; the excitation spectrum gives corresponding energy gap, and the system is in Mort-insulating state at Tonks limit. The analytic result of energy spectrum is in good agreement with that calculated in terms of Green＇s function at strong correlation limit.

关键词： hard-core boson energy spectrum excitation spectrum optical lattices

Improved Ligand-Field Calculation of energy spectrum and R-Line Thermal Shift of MgO：Cr^3＋

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Communications in Theoretical Physics 2007年第5期47卷 937-943页

作者： ZHANG Zheng-Jie MA Dong-Ping College of Information Engineering Chengdu University of Technology Chengdu 610059 China Department of Applied Physics Sichuan University Chengdu 610065 China

Traditional ligand-field theory has to be improved by taking into account both pure electronic contribution and electron-phonon interaction one （including lattice-vibrational relaxation energy）. By means of improved ligand-field theory, the R-line, t^3 2^2 T1 lines, t^2 2（^3 T1）e^4 T2, and t^2 2（^3T1）e^4T1 bands, ground-state g factor, four strain-induced level- splittings, and R-line thermal shift of MgO：Cr^3＋ have been calculated. The results are in very good agreement with the experimental data. It is found that for MgO：Cr^3＋, the contributions due to electron-phonon interaction （EPI） come from the first-order term. In thermal shift of R-line of MgO：Cr^3＋, the temperature-dependent contribution due to EPI is dominant.

关键词： improved ligand-field theory electron-phonon interaction energy spectrum strain-induced splitting thermal shift g factor

Corrections on energy spectrum and scatterings for fast neutron radiography at NECTAR facility

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Chinese Physics C 2013年第11期37卷 114-120页

作者：刘树全 Bcherl Thomas 李航邹宇斌陆元荣郭之虞 State Key Lab of Nuclear Physics and Technology & School of Physics Peking University Technische Universitt Mnchen ZTWB Radiochemie Mnchen RCM Walther-Meissner-Str3Garching 85748 Germany Institute of Nuclear Physics and Chemistry Chinese Academy of Engineering Physics

Distortions caused by the neutron spectrum and scattered neutrons are major problems in fast neutron radiography and should be considered for improving the image quality. This paper puts emphasis on the removal of these image distortions and deviations for fast neutron radiography performed at the NECTAR facility of the research reactor FRM-II in Technische Universit/it Mfinchen （TUM）, Germany. The NECTAR energy spectrum is analyzed and established to modify the influence caused by the neutron spectrum, and the Point Scattered Function （PSeF） simulated by the Monte-Carlo program MCNPX is used to evaluate scattering effects from the object and improve image quality. Good analysis results prove the sound effects of the above two corrections.

关键词： fast neutron radiography correction energy spectrum scattering NECTAR

Effects of Spatial Noncommutativity on energy spectrum of a Trapped Bose-Einstein Condensate

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Communications in Theoretical Physics 2006年第6X期46卷 966-968页

作者： LUO You-Hua GE Zi-Ming Institute for Theoretical Physics and Department of Physics East China University of Science and Technology Shanghai 200237 China

In noncommutative space, we examine the problem of a noninteracting and harmonically trapped Bose- Einstein condensate, and derive a simple analytic expression for the effect of spatial noncommutatlvity on energy spectrum of the condensate, it indicates that the ground-state energy incorporating the spatial noncommutativity is reduced to a lower level, which depends upon the noncommutativity parameter 8. The gap between the noncommutative space and commutative one for the ground-state level of the condensate should be a signal of spatial noncommutativity.

关键词： spatial noncommutativity energy spectrum Bose Einstein condensate