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Accurate studies on dissociation energies of diatomic molecules

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Science china(physics,Mechanics & Astronomy) 2007年第5期50卷 611-621页

作者： SUN WeiGuo1, FAN QunChao1 & REN WeiYi1,2 1 institute of physics, Sichuan university, Chengdu 610065, china 2 institute of Theoretical physics, Xihua normal university, Nanchong 637002, china institute of physics Sichuan University Chengdu 610065 China institute of Theoretical physics Xihua Normal University Nanchong 637002 China

The molecular dissociation energies of some electronic states of hydride and N2 molecules were studied using a parameter-free analytical formula suggested in this study and the algebraic method (AM) proposed recently. The results show that the accurate AM dissociation energies DeAM agree excellently with experimental dissociation energies Deexpt, and that the dissociation energy of an electronic state such as the 23Δg state of 7Li2 whose experimental value is not available can be predicted using the new formula.

关键词： algebraic method, diatomic molecule, vibrational energy, dissociation energy

B→Xsγ, Xsl+l~-Decays and Constraints on Mass Insertion Parameters in MSSM

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Communications in Theoretical physics 2006年第10期46卷 687-696页

作者： XIAO Zhen-Jun,~+ LI Feng-Ying, and ZOU Wen-Jun department of physics and institute of Theoretical physics, Nanjing normal university, Nanjing 210097, china department of physics Nanjing Normal University institute of Theoretical physics Nanjing Normal University

In this paper, we study the upper bounds on the mass insertion parameters (δ~q)in the minimal supersymmetric standard model. We found that the information from the measured branching ratio of B→Xl+l~-decaycan help us to improve the upper bounds on the mass insertions parameters(δ. Some regions allowed by thedata of Br(B→Xγ)are excluded by the requirement of an SM-like C(m)imposed by the data of Br(B→Xl+l~-).

关键词： B meson decay the minimal supersymmetric standard model mass insertion

Direct CP violation in hadronic B decays

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Science china(physics,Mechanics & Astronomy) 2006年第3期49卷 357-366页

作者： HONG Bihai1,2 & Lü Caidian3 1. department of physics, Lishui university, Lishui 323000,china 2. department of physics, Shanghai Jiaotong university, Shanghai 200030, china 3. institute of High Energy physics, Beijing 100049,china department of physics Lishui University Lishui 323000 China department of physics Shanghai Jiaotong University Shanghai 200030 China institute of High Energy physics Beijing 100049 China

There are different approaches for the hadronic B decay calculations, recently. In this paper, we upgrade three of them, namely factorization, QCD factorization and the perturbative QCD approach based on kT factorization, using new parameters and full wave functions. Although they get similar results for many of the branching ratios, the direct CP asymmetries predicted by them are different, which can be tested by recent experimental measurements of B factories.

关键词： CP violation hadronic B decay factorization.

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匀加速直线运动的Kerr黑洞的非热效应

物理学报 2002年第5期51卷 973-976页

作者：吕君丽湖南师范大学物理系长沙410081

研究了匀加速直线运动的Kerr黑洞周围时空中的自发辐射 .得到了发生自发辐射的能量条件 ,它不仅依赖于黑洞的角动量和加速度。

关键词：匀加速直线运动 Kerr黑洞非热效应非热辐射动态黑洞

Quantum Inequality Bounds for Free Rarita-Schwinger Field in Flat Spacetime

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Communications in Theoretical physics 2006年第7期 87-90页

作者： SHU Wei-Xing,~1 YU Hong-Wei,~2 LI Fei,~1 WU Pu-Xun,~2 and REN Zhong-Zhou~1 ~1department of physics, NanJing university, Nanjing 210093, china ~2department of physics, hunan normal university, changsha 410081, china

Although quantum field theory allows the local energy density negative, it also places severe restrictions on the negative energy. One of the restrictions is the quantum energy inequality (QEI), in which the energy density is averaged over time, or space, or over space and time. By now temporal QEIs have been established for various quantum fields, but less work has been done for the spacetime quantum energy inequality. In this paper we deal with the free Rarita-Schwinger field and present a quantum inequality bound on the energy density averaged over space and time. Comparison with the QEI for the Rarita-Schwinger field shows that the lower bound is the same with the QEI. At the same time, we find the quantum inequality for the Rarita-Schwinger field is weaker than those for the scalar and Dirac fields. This fact gives further support to the conjecture that the more freedom the field has, the more easily the field displays negative energy density and the weaker the quantum inequality becomes.

关键词： negative energy density quantum inequality

Challenges in the theoretical investigations of lipid membrane configurations

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Chinese physics B 2013年第2期22卷 36-44页

作者：涂展春 department of physics Beijing Normal University Kavli institute for Theoretical physics china Chinese Academy of Sciences

We report some key results in the theoretical investigations of configurations of lipid membranes and present several challenges in this field,which involve（i）the exact solutions to the shape equation of lipid vesicles,（ii）the exact solutions to the governing equations of open lipid membranes,（iii）the neck condition of two-phase vesicles in the budding state,（iv） the nonlocal theory of membrane elasticity,and（v）the relationship between the symmetry and the magnitude of the free energy.

关键词： configuration lipid membrane

THERMODYNAMICAL　CALCULATION　OF　FORMATION　ENTHALPIES　FOR　ALKALINE　METAL　ALLOYS

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中国有色金属学会会刊：英文版 1995年第1期5卷 94-100页

作者： Ouyang Yifang Zhang Bangwei Liao Shuzhi(International Centre for Materials physics, Academia Sinica, Shenyang 110015)(department of physics,hunan university, changsha 410082)(department of physics, hunan Educational institute, changsha 410012) ACAD SINICA INT CTR MAT PHYS SHENYANG 110015 PEOPLES R CHINA hunan UNIV DEPT PHYS CHANGSHA 410082 PEOPLES R CHINA hunan EDUC INST DEPT PHYS CHANGSHA 410012 PEOPLES R CHINA

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关键词： Miedema theory alkaline metal alloy mixing enthalpy formation enthalpy

Accurate studies on the full vibrational energy spectra and molecular dissociation energies for some electronic states of N_(2)molecule

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Science china(physics,Mechanics & Astronomy) 2005年第4期48卷 385-398页

作者： REN Weiyi1,2, SUN Weiguo1, HOU Shilin3 & FENG Hao4 1. institute of physics, College of Chemical Engineering, Sichuan university, Chengdu 610065, china 2. institute of Theoretical physics, Xihua normal university, Nanchong 637002, china 3. department of physics, china Oceanography university, Qingdao 266003, china 4. College of physics, Sichuan university, Chengdu 610065, china 1. institute of physics College of Chemical Engineering Sichuan University 610065 Chengdu China 2. institute of Theoretical physics Xihua Normal University 637002 Nanchong China 3. department of physics China Oceanography University 266003 Qingdao China 4. College of physics Sichuan University 610065 Chengdu China

It is usually very difficult to directly obtain molecular dissociation energy De and all accurate high-lying vibrational energies for most diatomic electronic states using modern experimental techniques or quantum theories, and it is also very difficult to give accurate analytical expression for diatomic molecular dissociation energy. This study proposes a new analytical formula for obtaining accurate molecular dissociation energy based on the LeRoy and Bernstein’s energy expression in dissociation limit. A set of full vibrational energy spectra for some electronic states of N2 molecule are studied using the algebraic method (AM) suggested recently, and the corresponding accurate molecular dissociation energies are evaluated using the proposed new formula and high-lying AM vibrational energies. The results show that the AM spectra and the new theoretical dissociation energies agree excellently with experimental data, and thereby providing a new physical approach to generating accurate dissociation energies for electronic states of diatomic molecules.

关键词： vibrational energy, dissociation energy, nitrogen molecule, algebraic method.

Generalized dromions of the (2+1)-dimensional nonlinear Schrdinger equations

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Communications in Nonlinear Science and Numerical Simulation 2001年第1期6卷 50-53页

作者： Jiefang ZHANG (institute of Nonlinear physics, Zhejiang normal university, Jinhua 321004, china) institute of Nonlinear physics Zhejiang Normal University Jinhua 321004 China

We derive the generalized dromions of the (2+1)-dimensional nonlinear Schrodinger equations besides the basic dromion solutions by suitably utilizing the arbitrary function in the bilinearized equations. The rich drom... 详细信息

关键词： dromion (2+1)-dimensional nonlinear Schrdinger equations