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New atomic data for Kr XXXV useful in fusion plasma

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Chinese Physics B 2013年第3期22卷 282-288页

作者： Sunny Aggarwal Jagjit Singh Man Mohan Department of Physics and Astrophysics University of Delhi

Energy levels and emission line wavelengths of high-Z materials are useful for impurity diagnostics due to their potential application in the next generation fusion *** this purpose,we have calculated the fine structural energies of the 67 levels belonging to the 1s 2,1s2l,1s3l,1s4l,1s5l,and 1s6l configurations of Kr XXXV using GRASP（general purpose relativistic atomic structure package） ***,we have reported the transition probabilities,oscillator strengths,line strengths,and transition wavelengths for some electric dipole（E1） transitions among these *** predict new energy levels and radiative rates,which have not been reported experimentally or theoretically,forming the basis for future experimental work.

关键词： atomic data general purpose relativistic atomic structure package(GRASP) code transition probability

Relativistic atomic data for W XLVⅡ

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Chinese Physics B 2015年第5期24卷 305-312页

作者： Sunny Aggarwal A.K.S.Jha Indu Khatri Narendra Singh Man Mohan Department of Physics and Astrophysics University of Delhi Department of Physics Shyamlal College University of Delhi

Energy levels, radiative rates, and lifetimes are calculated for all levels of 3s23p, 3s23d, 3s3p2, 3s3d2, 3s3p3d, 3p23d, 3s3d2, 3p3d2, 3p3, and 3d3 configurations of Al-like tungsten ion （W XLVII）. Multiconfigurational Dirac-Fock （MCDF） method is adopted for calculating energy levels and radiative rates. Oscillator strengths, radiative rates, and line strengths are reported for some E1 transitions from the ground level. Comparisons are made with the available data in the literature and good agreement has been found which confirms the reliability of our results.

关键词： atomic data multiconfigurational Dirac-Fock method transition probability

Extreme ultraviolet and x-ray transition wavelengths in Rb XXIV

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Chinese Physics B 2015年第10期24卷 115-126页

作者： Indu Khatri Arun Goyal Sunny Aggarwal A.K.Singh Man Mohan Department of Physics and Astrophysics University of Delhi Department of Physics Shyamlal CollegeUniversity of Delhi Department of Physics D.D.U.CollegeUniversity of Delhi

Energy levels, radiative rates, oscillator strengths and line strengths are reported for transitions among the lowest 97 levels of the（1s22s22p6） 3s23p2, 3s23p3 d, 3s3p3, 3p4, 3s3p23 d, and 3s23d2 configurations of Rb XXIV. A multiconfiguration Dirac-Fock（MCDF） method is adopted for the calculations. Radiative rates, oscillator strengths, and line strengths are provided for all electric dipole（E1）, magnetic dipole（M1）, electric quadrupole（E2）, and magnetic quadrupole（M2）transitions from the ground level to all 97 levels, although calculations are performed for a much larger number of *** achieve the accuracy of the data, comparisons are provided with similar data obtained from the Flexible atomic Code（FAC） and also with the available theoretical and experimental results. Our energy levels are found to be accurate to better than 1.2%. Wavelengths calculated are found to lie in EUV（extreme ultraviolet） and x-ray regions. Additionally, lifetimes for all 97 levels are obtained for the first time.

关键词： atomic data energy levels transition probability

atomic structure calculations for F-like tungsten

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Chinese Physics B 2014年第9期23卷 174-179页

作者： Sunny Aggarwal Department of Physics and Astrophysics University of Delhi

Energy levels, wavefunction compositions and lifetimes have been computed for all levels of ls^22s^22p^5, ls^22s^2p^6, ls^22s^22p^43s, ls^22s^22p^43p, and ls^22s^22p^43d configurations in highly charged F-like tungsten ion. The multiconfigurational Dirac-Fock method （MCDF） is adopted to generate the wavefunctions. We have also presented the transition wavelengths, oscillator strengths, transition probabilities, and line strengths for the electric dipole （El） and magnetic quadrupole （M2） transition from the ls^22s^22p^5 ground configuration. We have performed parallel calculations with the flexible atomic code （FAC） for comparing the atomic data. The reliability of present data is assessed by comparison with other theoretical and experimental data available in the literature. Good agreement is found between our results and those obtained using different approaches confirm the quality of our results. Additionally, we have predicted some new atomic data for F-like W that were not available so far and may be important for plasma diagnostic analysis in fusion plasma.

关键词： atomic data transition probability

Ridge regression energy levels calculation of neutral ytterbium(Z=70)

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Chinese Physics B 2023年第3期32卷 196-204页

作者：余雨姝杨晨蒋刚 Institute of atomic and Molecular Physics Sichuan UniversityChengdu 610065China Key Laboratory of High Energy Density Physics and Technology Ministry of EducationChengdu 610065China

In view of the difficulty in calculating the atomic structure parameters of high-Z elements,the Hartree–Fock with relativistic corrections(HFR)theory in combination with the ridge regression(RR)algorithm rather than the Cowan code’s least squares fitting(LSF)method is proposed and *** analyzing the energy level structure parameters of the HFR theory and using the fitting experimental energy level extrapolation method,some excited state energy levels of the Yb I(Z=70)atom including the 4f open shell are *** advantages of the ridge regression algorithm are demonstrated by comparing it with Cowan code’s LSF *** addition,the results obtained by the new method are compared with the experimental results and other theoretical results to demonstrate the reliability and accuracy of our approach.

关键词： atomic data ytterbium energy levels ridge regression algorithm

Photoionization of Ge^13＋ in the Inner-Shell 2p Excitation Energy Region

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Chinese Physics Letters 2006年第1期23卷 75-78页

作者：梁贵云赵刚 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 Beijing Key Laboratory for Nano-Photonics & Nano-Structure Capital Normal University Beijing 100037

The photoionization cross sections of the levels belonging to the ground configuration [Ne]3s^2 3p^6 3d of Ge^13＋ are investigated using the fully relativistic R-matrix method in the 2p - 3d excitation region. The photoionization cross section is dominated by 2p - 3d resonances. The detailed resonance structures are described and analysed with the resonance positions, widths and oscillator strengths to be determined. Good agreement is obtained between the length and velocity forms of the resonance oscillator strengths. The relative difference is less than 8%.

关键词： X-RAY TRANSMISSION R-MATRIX METHOD ELECTRON-SCATTERING atomic data OPACITY CALCULATIONS AL PLASMAS TEMPERATURE SPECTRUM

Mapping HⅠ in the NGC 4636 Galaxy Group with FAST

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Research in Astronomy and Astrophysics 2022年第9期22卷 202-222页

作者： Pei Zuo Dong Yang Jing Wang Lister Staveley-Smith Xuchen Lin Bi-Qing For Tobias Westmeier Jie Wang Kristine Spekkens Virginia Kilborn O.Ivy Wong Di Li Karen Lee-Waddell Barbara Catinella Luis C.Ho Barbel Koribalski Bumhyun Lee Ming Zhu Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China International Centre for Radio Astronomy Research(ICRAR) University of Western AustraliaCrawleyWA 6009Australia Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions(ASTRO 3D) Australia National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Department of Physics and Space Science Royal Military College of CanadaP.O.Box 17000Station ForcesKingstonOntarioK7K 7B4Canada Centre for Astrophysics and Supercomputing Swinburne University of TechnologyJohn StreetHawthorn3122Australia CSIRO Space and Astronomy Australia Telescope National FacilityP.O.Box 1130BentleyWA6102Australia Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China CSIRO Space and Astronomy Australia Telecope National FacilityP.O.Box 76NSW 1710Australia School of Science Western Sydney UniversityLocked Bag 1797PenrithNSW 2751Australia Korea Astronomy and Space Science Institute Daejeon 34055Republic of Korea

This paper presents data from a 21 cm H I emission drift scan observation of a field partially covering the NGC 4636 galaxy group with the Five-hundred meter Aperture Radio Telescope(FAST). We construct a pipeline to reduce the data, and use So Fi A for source finding. When not contaminated by Radio Frequency Interference(RFI), the FAST observations are capable of detecting all of the galaxies previously detected by the Arecibo Legacy Fast ALFA(ALFALFA) survey in the same region. Comparing to ALFALFA for the detections in common, the FAST data show consistent integrated spectra when the H I disks are spatially unresolved, and capture more flux when the H I disks are resolved. The FAST data further reveal 10 new detections in the region mutually covered with ALFALFA, and 18 new detections beyond the footprint of ALFALFA. All of the new detections have the matching optical counterparts. For the member galaxies of the NGC 4636 group, the detection limit of FAST is deeper by 0.4 dex in H I mass than that of the ALFALFA data. After correcting for the incompleteness caused by RFI contamination, we show that the H I detection rate of galaxies rises steeply with radius out to the virial radius of the group, and flattens beyond that. We also examine four spatially resolved galaxy systems with potential tidal interaction features in detail. Considering that the data have been taken during the“shared-risk” period before a major source of local RFI was eliminated, the results highlight the power of FAST in detecting extragalactic H I.

关键词： Galaxy:evolution atomic data galaxies:groups:general

Recent Progress in Radiative-Rate Determination of Some Heavy Ions (Xe9+, Xe10+, Lu3+, Hf4+, Ta5+) of Interest in Fusion

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Journal of Applied Mathematics and Physics 2021年第11期9卷 2848-2888页

作者： Saturnin Enzonga Yoca Faculty of Sciences and Techniques Marien Ngouabi University Brazzaville Congo African and Malagasy Council for Higher Education—CAMES Ouagadougou Burkina Faso

This paper presents a review about the radiative properties (transition probabilities and oscillator strengths) of two xenon ions (Xe9+, Xe10+) and three members of Er I isoelectronic sequence (Lu3+, Hf4+, Ta5+) of interest in controlled thermonuclear fusion, including our recent theoretical data obtained using two independent theoretical atomic structure computational approaches (semi-empirical Hartree-Fock with relativistic corrections method (HFR) and the ab initio multiconfiguration Dirac-Hartree-Fock (MCDHF)). The tables, from the second one, summarize the recommended data expected to be useful for plasma modelling in fusion.

关键词： atomic Spectra atomic data Transition Probabilities Oscillator Strengths Heavy Elements

Stark-broadened profiles of the spectral lines in He Ⅱ ions

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Stark-broadened profiles of the spectral lines in He Ⅱ ions