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An Effective Eigenchannel R-Matrix Method for Calculating Electron-Ion Scattering Processes with Spectroscopic Precision

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Chinese Physics Letters 2012年第3期29卷 71-74页

作者： GAO Xiang li jia-ming Beijing Computational Science Research Center Beijing 100084 Key Laboratory for Laser Plasmas(Ministry of Education)and Department of Physics Shanghai Jiao Tong UniversityShanghai 200240 Department of Physics and Center for Atomic and Molecular Nanosciences Tsinghua UniversityBeijing 100084

The electron-ion scattering processes are very important in various scientific research fields such as astrophysical studies and inertial confinement fusion *** report our recent development of an efficient method for providing such atomic data with spectroscopic *** on the Breit-Pauli and the Dirac R-matrix theory,we develop two eigenchannel R-matrix codes,referred to as R-eigen(non-relelativistic eigenchannel R-matrix)and R-R-eigen(relativistic eigenchannel R-matrix),to directly calculate the physical quantities in multichannel quantum defect theory in the whole energy *** such physical quantities,we can obtain all energy levels and the related scattering cross sections with accuracies comparable with spectroscopic *** e+Kr+system is used as an illustration example,the degrees of accuracies of scattering matrices are calculated within about 2%,which should be much more accurate than state-of-the-art scattering experiments.

关键词： quantities spectroscopic illustration

Theoretical Simulation of the Transmission Spectra of Fe and Ge Plasmas

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Chinese Physics Letters 2000年第3期17卷 194-196页

作者： YAN Jun li jia-ming Center of Atomic and Molecular Sciences Department of PhysicsTsinghua UniversityBeijing 100084 Institute of Physics Chinese Academy of SciencesBeijing 100080

Using the detailed conGguration accounting with the term structures treated by the unresolved transition array model,we present a method to calculate the transmission spectra of hot dense *** to the fully relativistic treatment,incorporated with the quantum defect theory to calculate the atomic parameters of the huge number of conGgurations with high principal quantum number,we can study the opacities for any middle-and high-Z plasmas with much less computational *** can also conveniently identify the dominant configurations and the detailed features of transition arrays,which are very helpful for the diagnostic of the plasma *** accuracy of our theoretical model is tested by comparing the calculated transmission spectra of Fe and Ge plasmas with the bench mark experimental data.

关键词： conditions. quantum transition

Relativistic Channel Theory: Abnormal Fine Structures of n^(2)D Rydberg States for Alkali Atoms

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Chinese Physics Letters 2001年第10期18卷 1334-1336页

作者： XIA Dan li jia-ming Center for Atomic and Molecular Nanosciences Department of PhysicsTsinghua UniversityBeijing 100084 Institute of Physics:Chinese Academy of Sciences Beijing 100080

Based on relativistic channel theory, we have studied the fine structures of n^(2)D Rydberg states for alkali atoms. We explain the abnormal fine structures owing to the competition effect of the spin-orbit interactio... 详细信息

关键词： Rydberg relativistic Alkali

Relativistic Multichannel Theory:Scaling Behavior of Multichannel Quantum Defect Theory Parameters(μ_(α),U_(iα)) Along the Ne-like Iso-electronic Sequence

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Chinese Physics Letters 1996年第4期13卷 269-272页

作者： ZOU Yu TONG Xiao-min li jia-ming Institute of Physics Chinese Academy of SciencesBeijing 100080 Institute of Applied Physics and Computational Mathematics Beijing 100088

The compact physical parameters(μ_(α),U_(iα))in multichannel quantum defect theory(MQDT)can be directly calculated with relativistic multichannel theory(RMCT).Here we report a systematic study of the MQDT parameters(fiay Uia)with RMCT along the Ne-like iso-electronic sequence(including Ca^(10+),Fe^(16+),Ge^(22+),Ag^(37+) ions).We find that the physical parameters(μ_(α),U_(iα))show a very interesting scaling behavior along the iso-electronic sequence.

关键词： electronic MQDT scaling

Optimum Metallic-Bond Scheme: A Quantitative Analysis of Mass Spectra of Sodium Clusters

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Chinese Physics Letters 2001年第12期18卷 1575-1577页

作者： SU Chang-Rong li jia-ming Department of Physics Center for Atomic and Molecular NanosciencesTsinghua UniversityBeijing 100084 Institute of Physics Chinese Academy of SciencesBeijing 100080

Based on the results of the optimum metallic-bond scheme for sodium clusters, we present a quantitative analysis of the detailed features of the mass spectra of sodium clusters. We find that, in the generation of sodium clusters with various abundances, the quasi-steady processes through adding or losing a sodium atom dominate. The quasi-steady processes through adding or losing a sodium dimer are also important to understand the detailed features of mass spectra for small clusters.

关键词： adding quasi spectra

Fine Structures of Atomic Excited States:Precision Atomic Spectroscopy and Electron-Ion Collision Process

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Chinese Physics Letters 2011年第3期28卷 47-50页

作者： GAO Xiang CHENG Cheng li jia-ming Key Laboratory for Laser Plasmas(Ministry of Education)and Department of Physics Shanghai Jiao Tong UniversityShanghai 200240 Department of Physics and Center for Atomic and Molecular Nanosciences Tsinghua UniversityBeijing 100084 Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800

Scientific research fields for future energies such as inertial confinement fusion researches and astrophysics studies especially with satellite observatories advance into stages of precision *** relevant atomic data are not only enormous but also of accuracy according to requirements,especially for both energy levels and the collision *** fine structure of high excited states of atoms and ions can be measured by precision *** precision measurements can provide not only knowledge about detailed dynamics of electron-ion interactions but also a bench mark examination of the accuracy of electron-ion collision data,especially incorporating theoretical *** illustrate that by using theoretical calculation methods which can treat the bound states and the adjacent continua on equal *** precision spectroscopic measurements of excited fine structures can be served as stringent tests of electron-ion collision data.

关键词： spectroscopy collision excited

Properties of Single-Wall Carbon Nanotubes with Finite Lengths

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Chinese Physics Letters 2001年第5期18卷 653-655页

作者： HU Di-li PAN Bi-Cai li jia-ming Center for Atomic and Molecular Nanoscience Tsinghua UniversityBeijing 100084 Institute of Physics Chinese Academy of SciencsBeijing 100080 Department of Physics University of Science and Technology of ChinaHefei 230026

Carbon nanotubes with finite lengths should be natural components of future“nano devices”.Based on orthogonal tight-binding molecular dynamics simulations,we report our study of formation energies,optimal geometrical structures and active sites of carbon nanotubes with finite *** should be useful to understand the properties of such natural components.

关键词： Carbon Finite finite

A study of novel real-time power balance strategy with virtual asynchronous machine control for regional integrated electric-thermal energy systems

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Science China(Technological Sciences) 2024年第7期67卷 2074-2086页

作者： WANG Rui li ming-jia WANG YiBo SUN QiuYe ZHANG Pinjia College of Information Science and Engineering Northeastern UniversityShenyang 110819China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

The development of regional integrated electric-thermal energy systems(RIETES) is considered a promising direction for modern energy supply systems. These systems provide a significant potential to enhance the comprehensive utilization and efficient management of energy resources. Therein, the real-time power balance between supply and demand has emerged as one pressing concern for system stability operation. However, current methods focus more on minute-level and hour-level power optimal scheduling methods applied in RIETES. To achieve real-time power balance, this paper proposes one virtual asynchronous machine(VAM) control using heat with large inertia and electricity with fast response speed. First, the coupling timescale model is developed that considers the dynamic response time scales of both electric and thermal energy systems. Second, a real-time power balance strategy based on VAM control can be adopted to the load power variation and enhance the dynamic frequency response. Then, an adaptive inertia control method based on temperature variation is proposed, and the unified expression is further established. In addition, the small-signal stability of the proposed control strategy is validated. Finally, the effectiveness of this control strategy is confirmed through MATLAB/Simulink and HIL(Hardware-in-the-Loop) experiments.

关键词： regional integrated electric-thermal energy systems real-time power balance virtual asynchronous machine adaptive inertia small-signal stability

Eigenchannel Theory and R-Matrix Theory

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Chinese Physics Letters 1996年第12期13卷 902-905页

作者： li jia-ming VO Ky-lan YAN Jun QU Yi-zhi Institute of Physics Chinese Academy of SciencesBeijing 100080 Observatoire de Nice URA 1362 du CNRSBP 22906304 Nice CedexFrance

We here combine the eigenchannel theory and R-matrix theory to calculate the eigenchannel parameters of multichannel quantum defect theory *** are two advantages:(1)an analytical unified treatment of perturbed discrete Rydberg states,autoionizing states and their adjacent continuum to avoid numerical calculations,outside the R-matrix box;(2)clear assignment of overlapped resonances.

关键词： states matrix unified