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Ab Initio Study of Single-and Double-Electron Capture Processes in Collisions of He^(2+) Ions and Ne Atoms

Chinese Physics Letters 2021年第11期38卷 30-36页

作者： Xiao-Xia Wang Kun Wang Yi-Geng Peng Chun-Hua Liu Ling Liu Yong Wu heinz-peter liebermann Robert JBuenker Yi-Zhi Qu College of Material Sciences and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Institute of Environmental Science Shanxi UniversityTaiyuan 030006China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China School of Physics Southeast UniversityNanjing 210094China Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

The single-and double-electron capture(SEC, DEC) processes of He^(2+) ions colliding with Ne atoms are studied by utilizing the full quantum-mechanical molecular-orbital close-coupling method. Total and state-selective SEC and DEC cross sections are presented in the energy region of 2 eV/u to 20 keV/u. Results show that the dominant reaction channel is Ne^(+)(2s2p^(6) ^(2)S) + He^(+)(1s) in the considered energy region due to strong couplings with the initial state Ne(2s^(2)2p^(6)^(1)S) + He^(2+) around the internuclear distance of 4.6 a.u. In our calculations, the SEC cross sections decrease initially and then increase whereby, the minimum point is around 0.38 keV/u with the increase of collision energies. After considering the effects of the electron translation factor(ETF), the SEC cross sections are increased by 15%–25% nearby the energy region of keV/u and agree better with the available results. The DEC cross sections are smaller than those of SEC because of the larger energy gaps and no strong couplings with the initial state. Due to the Demkov-type couplings between DEC channel Ne^(2+)(2s^(2)2p^(4)^(1)S) + He(1s^(2)) and the dominating SEC channel Ne^(+)(2s2p^(6) ^(2)S) + He^(+)(1s), the DEC cross sections increase with increasing impact energies. Good consistency can also be found between the present DEC and the experimental measurements in the overlapping energy region.

关键词： SEC DEC Ab Initio Study of Single-and Double-Electron Capture Processes in Collisions of He Ions and Ne Atoms

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Charge transfer and excitation processes in low energy collisions of He ions with Li atoms

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Research in Astronomy and Astrophysics 2021年第8期21卷 275-284页

作者： Xiao-Xia Wang Kun Wang Yi-Geng Peng Chun-Hua Liu Ling Liu Yong Wu heinz-peter liebermann Robert J.Buenker Yi-Zhi Qu College of Material Sciences and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Institute of Environmental Science Shanxi UniversityTaiyuan 030006China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China School of Physics Southeast UniversityNanjing 210094China Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

Electron capture between solar wind ions and neutral species has contributed to the understanding of X-ray production from solar system *** charge transfer and excitation processes in solar wind ions of He^(+)(1 s) colliding with Li(1 s^(2)2 s) atoms are studied by utilizing the full quantum-mechanical molecular-orbital close-coupling(QMOCC) method with impact energies of 0.003-2 keV *** of cross sections from single-and multi-configurational calculations for a selfconsistent field(SCF and MCSCF) process are carried *** show that the dominant reaction channels are He(1 s2 l ^(1,3) L)+Li^(+)(1 s^(2) ^(1) S).Good consistency is found among present total and state-selective charge transfer and excitation cross sections with other theoretical and experimental data in the same energy *** to the differences between coupling matrix elements in high-energy states,the charge transfer cross sections calculated from SCF and MCSCF split slightly as E> 0.4 keV *** Stueckelberg oscillations for charge transfer appear in the present *** addition,the differences of cross sections for electron excitation to Li(ls^(2)2 p) in the singlet/triplet molecular states with He+(1 s) are much smaller than those of charge transfer processes because of the similar energy gaps from Li(ls^(2)2 p) to the ground state in singlet/triplet states in the large R region.

关键词： Sun:solar wind ISM:molecules ISM:kinematics and dynamics molecular processes

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Time-frequency multiresolution of fault-generated transient signals in transmission lines using a morphological filter

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Protection and Control of Modern Power Systems 2023年第2期8卷 85-98页

作者： Juan Carlos Quispe John Morales Eduardo Orduna Carlo liebermann Michael Bruhns peter Schegner Universidad Nacional de San Juan-CONICET San JuanArgentina Universidad Tecnológica del Perú LimaPerú Technical University of Dresden DresdenGermany

The ongoing transformation of electrical power systems highlights the weaknesses of the protection schemes of traditional devices because they are designed and configured according to traditional characteristics of the ***,this work proposes a new methodology to study the fault-generated high frequency transient signals in transmission lines through multiresolution *** high frequency components are determined by a new digital filtering technique based on mathematical morphology theory and a spectral energy ***,wide spectra of signals in the time–frequency domain are *** performance of this method is verified on an electrical power system modeled in ATP-Draw,where simulation and test signals are developed for different locations,fault resistances,inception angles,high frequency noises,sampling frequencies,types of faults,and shapes of the structuring *** results show the characteristics of the fault such as the traveling wave frequency,location,and starting time.

关键词： Digital filter High frequency Mathematical morphology Time–frequency Traveling waves

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照片中的人与宇宙 2020格林尼治天文台摄影大赛

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科学世界 2021年第4期 98-109页

作者： [法国]Nicolas Lefaudeux(摄影) [美国]Alan Friedman(摄影) [德国]Stefan liebermann(摄影) [法国]Alain Paillou(摄影) [澳大利亚]peter Ward(摄影) [美国]Connor Matherne(摄影) [德国]Thomas Kast(摄影) 竹原谅贵徐煜华(翻译) 不详

英国格林尼治皇家天文台主办的天文摄影大赛已迎来第12个年头。本届大赛从全世界收到了超过5000件作品。让我们和天文摄影师藤井旭先生一同欣赏这些获奖作品,从中领略遥远的星云、美丽的星空以及临近天体的震撼景象。

关键词：格林尼治摄影大赛天文台摄影师获奖作品

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