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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For selected: Download citations EndNote Ris BibTeX Toggle thumbnails Select Absolute dielectronic recombination rate coefficients of highly charged ions at the storage ring CSRm and CSRe Zhongkui Huang(黄忠魁), Shuxing Wang(汪书兴), Weiqiang Wen(汶伟强), Hanbing Wang(汪寒冰), Wanlu Ma(马万路), Chongyang Chen(陈重阳), Chunyu Zhang(张春雨), Dongyang Chen(陈冬阳), Houke Huang(黄厚科), Lin Shao(邵林), Xin Liu(刘鑫), Xiaopeng Zhou(周晓鹏), Lijun Mao(冒立军), Jie Li(李杰), Xiaoming Ma(马晓明), Meitang Tang(汤梅堂), Jiancheng Yang(杨建成), Youjin Yuan(原有进), Shaofeng Zhang(张少锋), Linfan Zhu(朱林繁), and Xinwen Ma(马新文) Chin. Phys. B, 2023, 32 (7): 073401.   DOI: 10.1088/1674-1056/acbc69 Abstract （143）   HTML （2）    PDF （3175KB）（75）       Knowledge map    Dielectronic recombination (DR) is one of the dominant electron-ion recombination mechanisms for most highly charged ions (HCIs) in cosmic plasmas, and thus, it determines the charge state distribution and ionization balance therein. To reliably interpret spectra from cosmic sources and model the astrophysical plasmas, precise DR rate coefficients are required to build up an accurate understanding of the ionization balance of the sources. The main cooler storage ring (CSRm) and the experimental cooler storage ring (CSRe) at the Heavy-Ion Research Facility in Lanzhou (HIRFL) are both equipped with electron cooling devices, which provide an excellent experimental platform for electron-ion collision studies for HCIs. Here, the status of the DR experiments at the HIRFL-CSR is outlined, and the DR measurements with Na-like Kr25+ ions at the CSRm and CSRe are taken as examples. In addition, the plasma recombination rate coefficients for Ar12+, 14+, Ca14+, 16+, 17+, Ni19+, and Kr25+ ions obtained at the HIRFL-CSR are provided. All the data presented in this paper are openly available at https://doi.org/10.57760/sciencedb.j00113.00092. Select An effective method to calculate the electron impact excitation cross sections of helium from ground state to a final channel in the whole energy region Rui Sun(孙瑞), De-Ling Zeng(曾德灵), Rui Jin(金锐), Xiao-Ying Han(韩小英), Xiang Gao(高翔), and Jia-Ming Li(李家明) Chin. Phys. B, 2023, 32 (11): 113401.   DOI: 10.1088/1674-1056/acf11f Abstract （131）   HTML （1）    PDF （665KB）（64）       Knowledge map    The electron impact excitation (EIE) cross sections of an atom/ion in the whole energy region are needed in many research fields, such as astrophysics studies, inertial confinement fusion researches and so on. In the present work, an effective method to calculate the EIE cross sections of an atom/ion in the whole energy region is presented. We use the EIE cross sections of helium as an illustration example. The optical forbidden 11S-n1S (n = 2-4) and optical allowed 11S-n1P (n=2-4) excitation cross sections are calculated in the whole energy region using the scheme that combines the partial wave R-matrix method and the first Born approximation. The calculated cross sections are in good agreement with the available experimental measurements. Based on these accurate cross sections of our calculation, we find that the ratios between the accurate cross sections and Born cross sections are nearly the same for different excitation final states in the same channel. According to this interesting property, a universal correction function is proposed and given to calculate the accurate EIE cross sections with the same computational efforts of the widely used Born cross sections, which should be very useful in the related application fields. The datasets presented in this paper are openly available at https://www.doi.org/10.57760/sciencedb.j00113.00142. Select Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma Chunyu Zhang(张春雨), Kai Wang(王凯), Ran Si(司然), Jinqing Li(李金晴), Changxian Song(宋昌仙), Sijie Wu(吴思捷), Bishuang Yan(严碧霜), and Chongyang Chen(陈重阳) Chin. Phys. B, 2023, 32 (11): 113102.   DOI: 10.1088/1674-1056/acef07 Abstract （112）   HTML （3）    PDF （1350KB）（102）       Knowledge map    Atomic radiative data such as excitation energies, transition wavelengths, radiative rates, and level lifetimes with high precision are the essential parameters for the abundance analysis, simulation, and diagnostics in fusion and astrophysical plasmas. In this work, we mainly focus on reviewing our two projects performed in the past decade. One is about the ions with $Z\lesssim 30$ that are generally of astrophysical interest, and the other one is about the highly charged krypton (Z=36) and tungsten (Z=74) ions that are relevant in research of magnetic confinement fusion. Two different and independent methods, namely, multiconfiguration Dirac-Hartree-Fock (MCDHF) and the relativistic many-body perturbation theory (RMBPT) are usually used in our studies. As a complement/extension to our previous works for highly charged tungsten ions with open M-shell and open N-shell, we also mainly focus on presenting and discussing our complete RMBPT and MCDHF calculations for the excitation energies, wavelengths, electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transition properties, and level lifetimes for the lowest 148 levels belonging to the 3l3 configurations in Al-like W61+. We also summarize the uncertainties of our systematical theoretical calculations, by cross-checking/validating our datasets from our RMBPT and MCDHF calculations, and by detailed comparisons with available accurate observations and other theoretical calculations. The data are openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.10569. Select Oscillator strength and cross section study of the valence-shell excitations of NO2 by fast electron scattering Qiang Sun(孙强), Jin-Feng Chen(陈锦峰), Zhi-Wei Nie(聂智伟), Jian-Hui Zhu(朱剑辉), and Lin-Fan Zhu(朱林繁) Chin. Phys. B, 2023, 32 (11): 113402.   DOI: 10.1088/1674-1056/acf5d6 Abstract （103）   HTML （0）    PDF （1926KB）（46）       Knowledge map    Oscillator strengths and cross sections of the valence-shell excitations in NO2 are of great significance in testing the theoretical calculations and monitoring the state of the ozone layer in the earth's atmosphere. In the present work, the generalized oscillator strengths of the valence-shell excitations in NO2 were obtained based on the fast electron scattering technique at an incident electron energy of 1.5 keV and an energy resolution of about 70 meV. By extrapolating the generalized oscillator strengths to the limit of a zero squared momentum transfer, the optical oscillator strengths for the dipole-allowed transitions have been obtained, which provide an independent cross check to the previous experimental results. Based on the BE-scaling method, the corresponding integral cross sections have also been derived systematically from the excitation threshold to 5000 eV. The present dynamic parameters can provide the fundamental spectroscopic data of NO2 and have important applications in the studies of atmospheric science. The datasets presented in this paper, including the GOSs, OOSs and ICSs, are openly available at https://doi.org/10.57760/sciencedb.j00113.00156. Select Databases of 2D material-substrate interfaces and 2D charged building blocks Jun Deng(邓俊), Jinbo Pan(潘金波), and Shixuan Du(杜世萱) Chin. Phys. B, 2024, 33 (2): 026101.   DOI: 10.1088/1674-1056/ad0626 Abstract （92）   HTML （1）    PDF （1152KB）（64）       Knowledge map    Discovery of materials using "bottom-up" or "top-down" approach is of great interest in materials science. Layered materials consisting of two-dimensional (2D) building blocks provide a good platform to explore new materials in this respect. In van der Waals (vdW) layered materials, these building blocks are charge neutral and can be isolated from their bulk phase (top-down), but usually grow on substrate. In ionic layered materials, they are charged and usually cannot exist independently but can serve as motifs to construct new materials (bottom-up). In this paper, we introduce our recently constructed databases for 2D material-substrate interface (2DMSI), and 2D charged building blocks. For 2DMSI database, we systematically build a workflow to predict appropriate substrates and their geometries at substrates, and construct the 2DMSI database. For the 2D charged building block database, 1208 entries from bulk material database are identified. Information of crystal structure, valence state, source, dimension and so on is provided for each entry with a json format. We also show its application in designing and searching for new functional layered materials. The 2DMSI database, building block database, and designed layered materials are available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00113.00188. Select State-selective charge exchange cross sections in collisions of highly-charged sulfur ions with helium and molecular hydrogen Xiaolong Zhu(朱小龙), Shucheng Cui(崔述成), Dadi Xing(邢大地), Jiawei Xu(徐佳伟), B. Najjari, Dongmei Zhao(赵冬梅), Dalong Guo(郭大龙), Yong Gao(高永), Ruitian Zhang(张瑞田), Maogen Su(苏茂根), Shaofeng Zhang(张少锋), and Xinwen Ma(马新文) Chin. Phys. B, 2024, 33 (2): 023401.   DOI: 10.1088/1674-1056/ad0b01 Abstract （83）   HTML （3）    PDF （2055KB）（68）       Knowledge map    The state-selective cross section data are useful for understanding and modeling the x-ray emission in celestial observations. In the present work, using the cold target recoil ion momentum spectroscopy, for the first time we investigated the state-selective single electron capture processes for ${\rm S}^{q+}$-He and H$_{2}$ ($q=11$-15) collision systems at an impact energy of $q\times 20 $ keV and obtained the relative state-selective cross sections. The results indicate that only a few principal quantum states of the projectile energy level are populated in a single electron capture process. In particular, the increase of the projectile charge state leads to the population of the states with higher principal quantum numbers. It is also shown that the experimental averaged $n$-shell populations are reproduced well by the over-barrier model. The database is openly available in Science Data Bank at 10.57760/sciencedb.j00113.00091.