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Detailed Theoretical Investigations on the L-Shell Absorption of Open-M-Shell Germanium Plasmas:Effect of autoionization Resonance Broadening

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Journal of Modern Physics 2012年第10期3卷 1670-1677页

作者： Wenjun Xiang Jiaolong Zeng Yongsheng Fu Cheng Gao Department of Physics College of Science National University of Defense Technology Changsha China

Radiative opacity of open-M-shell germanium plasmas in the L-shell photon energy region were investigated in detail by using a fully relativistic detailed level accounting approach. Among other physical effects such as relativistic and the interaction between fine-structure levels belonging to the same non-relativistic configuration and different configurations, particular attention is paid on the effect of autoionization resonance broadening on the L-shell absorption. The results show that for plasmas at present and past typical experimental conditions, line width due to autoionization resonance broadening dominate among all the physical broadening mechanisms including electron impact and Doppler broadenings. Such an effect is most pronounced for ions with just a few 2p-nd transition lines such as Ge14+, while it is not so pronounced for complex ions such as Ge16+, where there are so many 2p-nd lines that line overlapping partly conceal the effect of autoionization resonance broadening. After taking the effect of autoionization resonance broadening into account, detailed comparisons are made with available experimental spectra at different physical conditions of different plasma temperatures and densities. The L-shell absorption is sensitive to the plasma temperature, especially in the 2p-3d excitation energy region. The potential of utlizing the relative shape and intensity of the 2p-3d spin-orbit splitting as temperature diagnostics is investigated.

关键词： autoionization Resonance Broadening Germanium Absorption Radiative Opacity

Delayed Ionization and Delayed Detachment in Molecules and Clusters

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Chinese Journal of Chemical Physics 2009年第2期22卷 162-170页

作者： F. Lépine B. Baguenard B. Concina M. A. Lebeault C. Bordas Université de Lyon F-69522 Lyon France Université Lyon 1 Villeurbanne CNRS UMR 5579 LASIM

The evolution of a molecular system excited above its ionization threshold depends on a number of parameters that include the nature of the excited states and their couplings to the various continua. The general nature of the processes governing this evolution depends also essentially on the complexity of the molecule, more precisely on its size, density of states, and strength of the couplings among the various internal degrees of freedom. In this paper we address the question of the transition between autoionization that prevails in small molecules, and delayed ionization occurring in larger molecules or clusters. This transition is illustrated by autoionization of Na2 Rydberg states on one hand, delayed ionization in fullerene C60, and delayed detachment in small cluster anions on the other hand. All processes are studied in the case of nanosecond laser excitation, corresponding to a rather slow deposition of the internal energy.

关键词： autoionization Autodetachment Thermionic emission

The effect of configuration complex on dielectronic recombination process in highly ionized plasmas

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Chinese Physics B 2008年第5期17卷 1845-1847页

作者：焦荣珍冯晨旭 School of Sciences Beijing University of Posts and Telecommunications

This paper analyses the effect of configuration complex on dielectronic recombination （DR） process in highly ionized plasmas （Xe^26＋, Dy^38＋, W^46＋） by using the multiconfiguration relativistic Hartree-Fock method. Resonant and nonresonant radiative stabilizing transitions and decays to autoionizing levels followed by radiative cascades are included. Collisional transitions following electron capture are neglected. The remarkable difference between the isoelectronic trend of the rate coefficients for DR through 3d^94l4l′ and through 3d^94l5l′ is emphasized. The trend of DR through 3d^94l4l′ shows irregularities at relatively low temperature due to the progressive closing of DR channels as atomic number Z increases.

关键词： dielectronic recombination autoionization radiative-decay

Emissivity: A Program for Atomic Transition Calculations

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Communications in Computational Physics 2010年第5期7卷 1118-1130页

作者： Taha Sochi University College London Department of Physics&AstronomyGower StreetLondonWC1E 6BTUK

In this article we report the release of a new program for calculating emissivity and other physical parameters in atomic transition *** program,which can be downloaded with its documentation and a sample of input and output files from ***/***,passed various rigorous tests and was used alongside R-matrix and Autostructure codes to generate theoretical data and analyze observational *** is particularly useful for investigating atomic transition lines in astronomical context as the program is capable of generating a huge amount of theoretical data and comparing it to observational line list.A number of atomic transition algorithms and analytical techniques are implemented within the program and can be very useful in various *** program can be described as fast and ***,it requires modest computational resources.

关键词： Atomic transition recombination autoionization emissivity computer code thermodynamic equilibrium decay routes Saha population

DIELECTRONIC RECOMBINATION RATE COEFFICIENTS FOR NEONLIKE IONS

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原子与分子物理学报 1996年第1期13卷 17-23页

作者： Zhao Libo Li Shichang(Institute of Physics. Chinese Academy of Sciences, P. O. Box 603 Beijing 100080)(Instiute of Applied Physics and Computational Mathematics, P. O. Box 8009 Beijing 100080) 中科院物理所北京 100080 北京应用物理和计算数学所北京 100080

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关键词： dielectronic recombination autoionization rate coefficient

OBSERVATION OF RYDBERG AUTOIONIZING STATE OF CS_2 AND HIGHER EXCITED VIBRATIONAL STATE OF CS_2^+

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Chinese Science Bulletin 1989年第17期34卷 1481-1485页

作者：范俊颖 E.PATSILINAKOU C.FOTAKIS Joint Laboratories for Quantum Optics Shanghai Institute of Optics and Fine MechanicsAcademia Sinica Institute of Electronic Structure & Laser P. O. Box 1527 Iraklin Research Center of Crete Greece

I. INTRODUCTION In recent years, the investigation of autoionization processes attracts much attention as MPI （multiphoton Ionization）spectroscopy has developed rapidly. However, much work has been done on atomic system. In comparison, the molecules have richer vibronic structure which makes the research more complicated. Great attention has been given to the MPI study of CS2 and CS2+. One of the reasons is that the CS2 mole-

关键词： autoionization spin-orbit splitting multiphoton ionization mixing state

High-resolution dipole (e, e) study for optical oscillator strengths of helium

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Science China Mathematics 1996年第12期39卷 1288-1295页

作者：凤任飞杨炳忻武淑兰邢士林张芳钟志萍郭学哲徐克尊 (Department of Modern Physics University of Science and Technology of China Hefei 230027 China)

The optical oscillator strengths of helium have been studied by a high-resolution dipole (e, e) method on the recently built high-resolution fast-electron energy-loss spectrometer. The difficulties of optical measurement have been avoided and the experimental precision has been improved by using this method. The optical oscillator strength density spectrum corresponding to the 1S n’P transitions and ionization of helium has been measured in the energy loss range of 21 - 26 eV. And the same work corresponding to the autoionization resonance region has been done in energy loss ranges of 59-67 eV and 69-74 eV. The above results have also been compared with those of the previous work.

关键词： helium optical oscillator strength high-resolution dipole (e e) method discrete transition autoionization resonance.

Energy Positions of the 1,3DeRydberg Series of the He-Like Ions Up to the N= 9 Threshold

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Journal of Applied Mathematics and Physics 2020年第8期8卷 1535-1549页

作者： Matabara Dieng Babou Diop Malick Sow Youssou Gning Mamadi Biaye Ababacar Sadikhe Ndao Ahmadou Wagué Department of Physics UFR-SATIC University Alioune Diop of Bambey Bambey Senegal Laboratoire Atomes-Lasers Department of Physics University Cheikh Anta Diop Dakar Senegal Department of Physics and Chemistry Faculty of Sciences and Technologies of Formation and Education University Cheikh Anta Diop Dakar Senegal

The doubly excited states of helium-like ions are investigated using a combination of the no-linear parameters of Hylleraas and the β-parameters of screening constant by unit nuclear charge. Calculations are performed for total energies of low-lying doubly excited states (N = 2 - 9) in He-like ions up to Z = 10. The results obtained from the novel method are in good agreement with the available theoretical calculations and experimental observations.

关键词： Electronic Correlations Variational Calculations Atoms And Ions Helium-Like Systems Singlet States Triplet States Matrix Elements Doubly-Excited States autoionization

Variational Calculations for (ns²) ¹Se, (np²) ¹D^e and (nd²) ¹G^e Resonance States for He Isoelectronic Sequences below the n = 2, 3 and 4 Hydrogenic Thresholds

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Journal of Modern Physics 2023年第12期14卷 1617-1633页

作者： Matabara Dieng Department of Physics UFR-SATIC University Alioune Diop of Bambey Bambey Senegal

This work presents results of the different parameters which characterize the nonrelativistic Hamilton operator for the helium atoms allowing us to solve the Schrödinger equation. The total energy is decomposed into three terms allowing to separate the kinetic energy, the electrons-nucleus interaction energy and the electron-electron interaction energy of the (2s2, 3s2 and 4s2) 1Se, (2p2, 3p2 and 4p2) 1De and (3d2 and 4d2) 1Ge resonance singlet states of the helium isoelectronic sequences. The states have been defined by using special forms of the Hylleraas type wave functions. The calculations have been carried out in the framework of the variational method using configuration interaction basis states with a real Hamiltonian. The agreement of the energy value of other states between the present theoretical values available in the literature is excellent. But as for the comparison of the kinetic energies, the electrons-nucleus energies interaction and the electron-electron interaction energies, we note a slight difference with the theoretical values common in literature.

关键词： Hylleraas Method Helium-Like Ions Systems Singlet Doubly-Excited States Matrix Elements autoionization