Journal Article10.1086/344745
Indirect X-Ray Line-Formation Processes in Iron L-Shell Ions
TL;DR: In this paper, the role of indirect processes in the soft X-ray line formation of iron L-shell ions, using a newly developed, relativistic, multiconfigurational atomic package, was investigated.
read more
Abstract: We present a systematic study of the role of indirect processes in the soft X-ray line formation of iron L-shell ions, using a newly developed, relativistic, multiconfigurational atomic package. These indirect processes involve the neighboring charge states of the target ion, namely, radiative recombination, dielectronic recombination, and resonance excitation. For Fe XVII, the inner-shell collisional ionization (CI) is also relevant. Lines originating from 3s and 3p upper levels of Fe XVII-XX are found to be significantly affected by these processes, with some lines being enhanced by nearly a factor of 2 at the temperature of maximum fractional abundance in CI equilibrium. Such enhancement, although not enough to completely explain the observed line ratios from various astrophysical sources, is a vast improvement over the previous models neglecting these processes. Rate coefficients for individual processes are tabulated, which can be conveniently included in spectral models to correctly account for these effects. As a by-product of this investigation, the total recombination and ionization rates of all Fe L-shell ions are tabulated as a function of temperature.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Characteristics of x-ray emission from optically thin high-Z plasmas in the soft x-ray region
Hayato Ohashi,Takeshi Higashiguchi,Yuhei Suzuki,Goki Arai,Bowen Li,Padraig Dunne,Gerry O'Sullivan,Hiroyuki A. Sakaue,Daiji Kato,Izumi Murakami,Naoki Tamura,Shigeru Sudo,Fumihiro Koike,Chihiro Suzuki +13 more
TL;DR: In this article, the characteristics of soft x-ray emission from optically thin high-Z plasmas of gold, lead and bismuth were investigated with the large helical device.
6
•Dissertation
Spectroscopy of high-Z ions as a way to understanding the nature of Cas A knots and intergalactic shocks
Dmitrijs Docenko
- 09 May 2008
TL;DR: In this article, the spectral lines of isotopes and ions abundant at temperatures 10 − 10 K, characteristic for warm-hot intergalactic medium, hot interstellar medium, starburst galaxies, their superwinds and young supernova remnants are discussed.
6
Spectroscopic studies of shell mix in directly driven implosion on SGIII prototype laser facility
Yudong Pu,Tianxuan Huang,Minxi Wei,Qi Tang,Zifeng Song,Jiamin Yang,Shenye Liu,Shaoen Jiang,Yongkun Ding +8 more
TL;DR: In this paper, the shell mix during implosion using a capsule with a Cl-doped gas-shell interface that is also filled with Ar-deuterium gas was studied.
6
Simulations of the spectrum from a photoionized Si plasma
TL;DR: In this paper, the level populations and emissions of photoionized Si plasmas were calculated using a collisional-radiative equilibrium model with detailed atomic data and electron impact processes.
6
Strong configuration interactions in Be-like ions
TL;DR: In this article, Zhang et al. observed strong configuration interactions in Be-like ions between 1s(1)2s(2)nl(1), and 1s (1) 2s( 1)2p(2 )nl( 1), where the number of electrons in each shell was the same and the parity for each shell is the same.
6
References
Binary-encounter-dipole model for electron-impact ionization
Yong-Ki Kim,M. Eugene Rudd +1 more
TL;DR: In this article, a theoretical model for calculating electron-impact ionization cross sections for atoms and molecules is presented, which combines the binary-encounter theory with the dipole interaction of the Bethe theory for fast incident electrons.
Iron ionization and recombination rates and ionization equilibrium
M. Arnaud,J. Raymond +1 more
TL;DR: In this article, a critical review of the existing data on ionization and dielectronic recombination and present new computations of radiative recombination rate coefficients of Fe(+14) through Fe(−25) using the photoionization cross sections of Clark et al.
700
HULLAC, an integrated computer package for atomic processes in plasmas
TL;DR: H ULLAC as mentioned in this paper, an integrated code for calculating atomic structure and cross sections for collisional and radiative atomic processes, is based on relativistic quantum mechanical calculations including configuration interaction.
518
High-Resolution X-Ray Spectra of Capella: Initial Results from the Chandra High-Energy Transmission Grating Spectrometer
Claude R. Canizares,David P. Huenemoerder,David S. Davis,Daniel Dewey,Kathryn A. Flanagan,John C. Houck,Thomas H. Markert,Herman L. Marshall,Mark L. Schattenburg,Norbert S. Schulz,Michael W. Wise,Jeremy J. Drake,Nancy Brickhouse +12 more
TL;DR: In this article, high-resolution spectra of the active binary Capella (G8 III + G1 III) covering the energy range of 0.4-8.0 keV (1.5-30 A) show a large number of emission lines, demonstrating the performance of the High Energy Transmission Grating Spectrometer.
Laboratory Measurements and Modeling of the Fe XVII X-Ray Spectrum
Gregory V. Brown,Gregory V. Brown,Peter Beiersdorfer,Duane A. Liedahl,Klaus Widmann,Steven M. Kahn +5 more
TL;DR: In this article, the Fe XVII L-shell emission spectrum between 9.8 and 17.5 A was analyzed under precisely controlled conditions where electron-impact excitation followed by radiative cascades is the dominant line formation process.
180