A5113404172- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Mass Spectrometry Techniques and Applications
- Astronomical Observations and Instrumentation
- Integrated Energy Systems Optimization
- Advanced Chemical Physics Studies
- High-pressure geophysics and materials
- Astrophysical Phenomena and Observations
- Magnetic confinement fusion research
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Plasma Diagnostics and Applications
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Nuclear physics research studies
- Electric Power System Optimization
- Superconducting and THz Device Technology
- Pulsed Power Technology Applications
Chinese Academy of Sciences
2016-2025
National Astronomical Observatories
2016-2025
Zhongshan People's Hospital
2024
Beijing Normal University
2023-2024
Inner Mongolia University of Science and Technology
2024
Beihang University
2017
Vatican Secret Archives
2013
Nanjing Library
2013
University of Strathclyde
2008-2012
Max Planck Institute for Nuclear Physics
2007-2009
We have carried-out parallel intermediate-coupling frame transformation R-matrix calculations for electron-impact excitation amongst the 204 close-coupling levels of 2sx2py (x + y = 3), 2s2{3,4}l, 2s2p{3,4}l, and 2p23l configurations all boron-like ions from C+ to Kr31+. also included configuration interaction due 2p24l, 2s3l3l′ 2p3s3l configurations. A detailed comparison has been made target structure data four specific (viz., Ne5+, Ar13+, Fe21+ Kr31+) that span sequence, so as assess...
We present results for the electron-impact excitation of all Ne-like ions from Na<sup>+<sup/> to Kr<sup>26+<sup/> obtained using intermediate-coupling frame transformation <i>R<i/>-matrix approach. For each ion's calculation, close-coupling expansion is taken be 113 LS terms (209 levels) belonging configurations [ 1s<sup>2<sup/>] 2s<sup>2<sup/>2p<sup>6<sup/>, 2s<sup>2<sup/>2p<sup>5<sup/>{3, 4, 5}<i>l<i/>, 2s2p<sup>6<sup/>{3, 5}<i>l<i/> (<i>l<i/> <i>∈<i/> , and ),...
We present results for the electron-impact excitation of all Li-like ions from Be+ to Kr33+ which we obtained using radiation- and Auger-damped intermediate-coupling frame transformation R-matrix approach. have included both valence- core-electron excitations up 1s25l 1s2l4l′ levels, respectively. A detailed comparison target structure collision data has been made four specific (O5+, Ar15+, Fe23+ Kr33+) spanning sequence so as assess accuracy entire sequence. Effective strengths (Υs) are...
We demonstrate a novel plasma device for magnetic reconnection, driven by Gekko XII lasers irradiating double-turn Helmholtz capacitor-coil target. Optical probing revealed an accumulated plume near the reconnection outflow. The background electron density and field were measured to be approximately 1018 cm−3 60 T using Nomarski interferometry Faraday effect, respectively. In contrast with experiments on constructed Biermann battery which produced high beta values, our value was much lower...
ABSTRACT Laboratory experiments have been carried out to model the magnetic reconnection process in a solar flare with powerful lasers. Relativistic electrons energy up megaelectronvolts are detected along separatrices bounding outflow, which exhibit kappa-like distribution an effective temperature of ∼10 9 K. The acceleration non-thermal is found be more efficient case guide field (a component reconnection-induced electric field) than without field. Hardening spectrum at energies ≥500 keV...
Accurate excitation parameters are required to interpret the ultraviolet and X-ray spectra of Fe13+. In this work, we use AUTOSTRUCTURE code describe atomic structure The 197 lowest-lying fine-structure levels 3s(x)3p(y)3d(z) (x + y z = 3), 3s(2)4l, 3s3p4{s, p, d} configurations included along with further correlation configurations: 3s3p4f, 3p(x)3d(y)4l 2), 3l4l'4l '', 3l3l'5l ''. resultant level energies, lifetimes excited states, oscillator strengths transitions between these assessed by...
In this review we summarize the recent calculations and improvements of atomic data that have carried out for analysis astrophysical spectroscopy within processes plasmas network. We briefly discuss various methods used calculations, highlight several issues uncovered during such extensive work. completeness accuracy cross sections ionic excitation by electron impact main isoelectronic sequences, which obtained with large-scale calculations. Given its importance, emphasize work on iron. Some...
Abstract Charge exchange between highly charged ions and neutral atoms molecules has been considered as one of the important mechanisms controlling soft X-ray emissions in many astrophysical objects environments. However, for modeling charge emission, data n- l -resolved state-selective capture cross sections are often obtained by empirical semiclassical theory calculations. With a newly built cold target recoil-ion momentum spectroscopy (COLTRIMS) apparatus, we perform series measurements...
Systematic R-matrix calculations of electron-impact excitation for ions astrophysical interest have been performed since 2007 many iso-electronic sequences as part the UK Atomic Process Astrophysical Plasma (APAP) network. Rate coefficients Maxwellian electron distributions provided and used extensively in literature databases astrophysics. Here, we provide averaged collision strengths to be model plasma where electrons are non-Maxwellian, which often occurs laboratory plasma. We also new...
Abstract Soft X-ray emissions from solar wind charge exchange (SWCX) are applied in a recently developed approach to study the magnetosphere using panoramic soft imaging. This represents first attempt distinguish magnetospheric SWCX observed by XMM-Newton during impact of an interplanetary coronal mass ejection (ICME) and its driven sheath on Earth. In addition, data Advanced Composition Explorer (ACE) were available this same observational period, which is rare previous studies. Results...
Spectra in the extreme ultraviolet range from 107 to 353 Å emitted Fe ions various ionization stages have been observed at Heidelberg electron beam ion trap (EBIT) with a flat-field grating spectrometer. A series of transition lines and their intensities analyzed compared collisional-radiative simulations. The present model reproduces well relative line facilitates identification produced EBIT. polarization effect on resulting nonthermal unidirectional impact was explored found be...
Extreme-ultraviolet spectra of intermediately ionized iron ions (Fe vi–Fe xiv) in the wavelength range 125.0–265.0 Å have been measured at Heidelberg electron beam ion trap. Emission were recorded sequentially while varying energy over 75–544 eV steps 5 eV. The observed clearly show evolution each ionic stage as a function energy, allowing to distinguish emission lines from neighboring charge species and helping disentangle possible line blends. collisional-radiative modeling satisfactorily...
As a promising new way to generate controllable strong magnetic field, laser-driven coils have attracted interest in many research fields. In 2013, kilotesla level field was achieved at the Gekko XII laser facility with capacitor–coil target. A similar approach has been adopted number of laboratories, variety targets different shapes. The peak strength varies from few tesla kilotesla, spatio-temporal ranges. differences are determined by target geometry and parameters incident laser. Here we...
ABSTRACT Charge exchange has been recognized as a primary source of soft X-ray emission in many astrophysical outflow environments, including cometary and planetary exospheres impacted by the solar wind. Some models have set up using different data collections charge-exchange cross-sections. However, multiple-electron transfer not included these models. In this paper, we model with inclusion double-electron capture (DEC), make detailed investigation process on emissions highly charged...
We present results for the inner-shell electron-impact excitation of all Na-like ions from Mg+ to Kr25+ obtained using intermediate-coupling frame transformation R-matrix method with both Auger and radiation damping included via optical potential approach. For each ion, target close-coupling expansions are taken be 59 LS terms (134 levels) belonging configurations 2s22p63l, 2s22p53s3l (l s, p, d), 2s22p53p2 2s22p53p3d. Radial wavefunctions were autostructure. Effective collision strengths...
We present the results of an intermediate coupling frame-transformation <i>R<i/>-matrix calculation for electron-impact excitation Si<sup>9+<sup/>. The target and close-coupling expansions are both taken to be 125 fine-structure levels (58 LS terms) belonging configurations 2s<sup><i>x<i/><sup/>2p<sup><i>y<i/><sup/> () 2s2p3<i>l<i/> (<i>α<i/>+<i>β<i/> = 2, <i>l<i/> s, p, d). Due additional resonances included in our calculation, we find significant differences at low temperatures with widely...
Several laboratory facilities were used to benchmark theoretical spectral models that are extensively by astronomical communities. However, there still many differences between astrophysical environments and miniatures can be archived. Here we setup a analysis system for plasmas make bridge them, investigate the effects from non-thermal electrons contributions metastable level population on populations charge stage distribution coronal-like, photoionized, geocoronal plasmas. Test...
Intershell, resonant electronic recombination is studied experimentally in an electron-beam ion trap for O-like ${\mathrm{Si}}^{6+}$ to He-like ${\mathrm{Si}}^{12+}$ ions at plasma temperatures the megakelvin range similar those found solar radiative zone and compared extended multiconfiguration Dirac-Fock relativistic configuration-interaction predictions. For this low-$Z$ ion, higher-order processes are comparable strength first-order one. The ratio of trielectronic dielectric B-like...
A pair of collisionless shocks that propagate in the opposite directions are firstly observed interactions laser-produced counter-streaming flows. The flows generated by irradiating a opposing copper foils with eight laser beams at Shenguang-II (SG-II) facility. experimental results indicate excited and electrostatic, good agreement theoretical model electrostatic shock. particle-in-cell (PIC) simulations verify strong field growing from interaction region contributes to formation. evolution...
Observational data for cool star Procyon available from the Chandra Data Public Archive are co-added and analyzed with as high a signal-to-noise ratio possible. The soft X-ray emission lines of highly charged sulfur ions (S vii–S xv) investigated in 30–80 Å range. A collisional-radiative model is constructed to predict line emissivities using updated excitation R-matrix method. Theoretical fluxes intensity ratios calculated, theoretical spectra Gaussian profile width 0.06 Å. By comparing...
A double-turn capacitor-coil is used to produce a magnetic field (38.5 T) and construct topology of reconnection in low-β (β < 1) plasma environment. The device constructed with two metallic U-turn coils connecting parallel disks. High energy lasers are employed ablate one disk spontaneously driving currents the coils, which produces an interactive topology. We demonstrated through experiments numerical simulations that process takes place between non-uniform fields created by state...
We present results for the electron-impact excitation of highly-charged sulphur ions (S8+ - S11+) obtained using intermediate-coupling frame transformation R-matrix approach. A detailed comparison target structure has been made four to assess uncertainty on collision strengths from structure. Effective (\Upsilon s) are presented at temperatures ranging 2\times10^2(z+1)^2 K 2\times10^6(z+1)^2 (where z is residual charge ions. Detailed comparisons \Upsilon with previous calculations these...
Abstract Soft X-ray emissions induced by solar wind ions that collide with neutral material in the system have been detected around planets, and were proposed as a remote probe for interaction Martian exosphere. A multi-fluid three-dimensional magnetohydrodynamic model is adopted to derive global distributions of particles. Spherically symmetric exospheric H, H 2 , He, O, CO density profiles sophisticated hybrid includes charge-exchange proton–neutral excitation processes are used study low...
A compact flat-field soft x-ray grazing-incidence grating spectrometer equipped with a cryogenically cooled back-illuminated charge-coupled device camera was built and implemented at the Heidelberg Electron Beam Ion Trap. The instrument spans spectral region from 1to37nm using two different gratings. In slitless operation mode, it directly images radiation source, in this case ions confined an electron beam ion trap, high efficiency reaching hereby resolving power of λ∕Δλ≅130 2nm λ∕Δλ≅600...