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Positron-Lithium Atom and Electron-Lithium Atom Scattering Systems at Intermediate and High Energies

Chinese Physics Letters 2006年第7期23卷 1753-1756页

作者： k. ratnavelu S. Y. Ng Institute of Mathematical Sciences Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia Department of Physics Faculty of Science National University of Singapore Singapore

The coupled-channel optical method is used to study positron scattering by atomic lithium at energies ranging from the ionization threshold to 60eV, The present method simultaneously treats the target channels and the positronium （Ps） channels in the coupled-channel method together with the continuum effects via an ab-initio optical potential. Ionization, elastic and inelastic cross sections in target channels, and the total cross section are also reported and compared with other theoretical and experimental data. A comparative study with the corresponding electron-lithium data is also reported.

关键词： CLOSE-COUPLING THEORY HYDROGEN SCATTERING CROSS-SECTIONS COLLISIONS

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Resonances in Electron Impact on Atomic Oxygen

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Chinese Physics Letters 2008年第6期25卷 2027-2029页

作者：王旸周雅君焦利光 k.ru ratnavelu Institute of Atomic and Molecular Physics Jilin University Changchun 130012 Institute of Mathematical Sciences University of Malaya 50603 Kuala Lumpur Malaysia

The momentum-space coupled-channels-optical （CCO） method is used to study the resonances in electron oxygen collision in the energy region of 9-12 eV, Present results have shown agreement with the available experime... 详细信息

关键词： supernova explosion proto-neutron star shock.wave

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Structural Stability, Electronic Structure and Mechanical Properties of Li–N–H System

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 550-558页

作者： ratnavelu Rajeswarapalanichamy Manoharan Santhosh Ganesapandian Sudhapriyanga Shanmugam k.nagaprabha k.mbaih Iyak.tti Department of Physics N.M.S.S.V.N College Department of Physics Kamaraj College Department of Physics and Nanotechnology SRM University

Ab initio calculations are performed to investigate the ground state properties, structural phase transition, electronic structure and mechanical properties of lithium nitride （Li3N）, lithium imide （Li2NH） and lithium amide （LiNH2）. The computed ground state properties lik. equilibrium lattice constant, cell volume, valence electron density, cohesive energy, bulk.modulus and its derivatives are in good agreement with available experimental data. The structural phase transitions from α-P6/mmm to β-P63/mmc phase at a pressure of 17.5 GPa in LiaN and cubic （Fm3m） to hexagonal （P63/ mmc） phase at a pressure of 102 GPa in lithium imide （Li2NH） are observed. A new high pressure hexagonal （P63/mmc） phase is predicted for LiENH. Electronic structure reveals that Li3N and LiNH2 are semiconductors, whereas Li2NH is an insulator. The calculated elastic constants indicate that these materials are mechanically stable at ambient condition.

关键词： Ab initio calculations Crystal structure Phase transition Electronic structure Mechanicalproperties

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Investigation of Structural, Electronic and Mechanical Properties of Rubidium Metal Hydrides RbMH_4(M=B, Al, Ga)

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Acta Metallurgica Sinica(English Letters) 2015年第8期28卷 975-983页

作者： Santhosh Manoharan Rajeswarapalanichamy ratnavelu Sudhapriyanga Ganesapandian k.nagaprabha Shanmugam Iyak.tti k.mbiah Department of Physics N.M.S.S.V.N College Department of Physics Kamaraj College Department of Physics and Nanotechnology SRM University

Ab initio calculations are performed to investigate the structural stability, electronic structure and mechanical properties of rubidium metal hydrides RbMH4（M = B, Al, Ga） for five different crystal structures, namely hexagonal（P63mc）, tetragonal（P42/nmc）, tetragonal（P421c）, orthorhombic（Pnma） and monoclinic（P21/c）. Among the considered structures, tetragonal（P421c） phase is found to be the most stable one for these metal hydrides at normal pressure. A pressure-induced structural phase transition from tetragonal（P421c） to monoclinic（P21/c） phase is observed in all the three metal hydrides. The electronic structure reveals that these hydrides are wide band gap semiconductors. The calculated elastic constants indicate that these alk.li metal tetrahydrides are mechanically stable at normal pressure.

关键词： Ab initio calculations Crystal structure Phase transitions Electronic structure Mechanical properties

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Resonances for positron–helium and positron–lithium systems in k.ppa-distribution plasma

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Chinese Physics B 2018年第12期27卷 244-249页

作者： Zi-Shi Jiang Ya-Chen Gao k.y Laboratory of Electronics Engineering College of Heilongjiang ProvinceHeilongjiang Universityand College of Physical Science and TechnologyHeilongjiang UniversityHarbin 150080China Department of Physics Harbin Institute of TechnologyHarbin 150001China Department of Mathematics University of MalayaKuala LampurMalaysia

S-wave resonances of positron–helium and positron–lithium systems in k.ppa-distribution plasmas are investigated using Hylleraas-type wave functions in the framework.of the stabilization method. A model potential approach is used to represent the interactions between the outer electron, the positron and the core. The resonance parameters(position and width) of positron–helium and positron–lithium systems below the Ps(2s) threshold are reported as a function of screening parameter and spectral index of plasma.

关键词： positron–atom scattering k.ppa-distribution plasmas model potential approach variational method

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