Opacity Studies of Silicon in Radiatively Heated Plasma

Wei, Hui; Shi, J. R.; Zhao, Gang; Zhang, Yi; Dong, Quan; Li, Yutong; Wang, Shoujun; Zhang, Jie; Liang, Zuo-tang; Zhang, Jiyan; Wen, T. S.; Zhang, Wenhai; Hu, Xiangming; Liu, Shenye; Ding, Yongkun; Zhang, Lin; Tang, Yongjian; Zhang, Baohan; Zhi-Jian, Zheng; Nishimura, Hiroaki; Fujioka, Shinsuke; Wang, Feilu; Takabe, H.

doi:10.1086/588750

Cited by 30 publications

(21 citation statements)

References 43 publications

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“…Few works related to K-shell transitions from high excited states have been reported yet these transitions are important and necessary to model and analyze the absorption spectra of radiatively heated plasmas (Jin et al 2008;Wei et al 2008). The K-shell absorptions lines originating from these high excited states of Be-like O v have been observed (Holczer et al 2010).…”

Section: Introductionmentioning

confidence: 99%

K-shell energy levels and radiative rates for transitions in Si xi

Wei

Shi

Zhao

et al. 2010

A&A

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Context. Atomic data for K-shell transitions are essential for modeling the K absorption lines, which have been observed in the spectra of active galaxies by high-resolution X-ray observatories, e.g. XMM, Chandra, and Suzaku. These accurate atomic data are also needed for line identifications and spectroscopic diagnostic of plasmas in laboratory generated by laser or beam-foil method. Aims. We calculate atomic data using the atomic code flexible atomic code (FAC) taking relativistic effects and configuration interactions into account. Methods. We calculate the K-shell transitions among the configurations of 1s 2 2s 2 , 1s 2 2s2p, 1s 2 2p 2 , 1s 2 2sn l , 1s 2 2pn l , 1s2s 2 2p, 1s2s2p 2 , 1s2p 3 , 1s2s2pn l , and 1s2p 2 n l , n ≤ 4, l ≤ n for beryllium-like Si xi. We present the K-shell energy levels, wavelengths, radiative rates, and oscillator strengths for Si xi. To assess the accuracy of current data, we compare our results with both former experiments and other theoretical works.Results. The present K-shell level energies and wavelengths are accurate to within 2 eV and 10 mÅ, respectively. The radiative rates have an accuracy of around 20% for the majority of our transitions.

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Section: Introductionmentioning

confidence: 99%

K-shell energy levels and radiative rates for transitions in Si xi

Wei

Shi

Zhao

et al. 2010

A&A

Self Cite

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“…These lines were not detected in case of using the other sources. The only exception was the 2s 2 2p 4 -2s2p 5 line at the wavelength of l = 37.9 nm. Intensity of this line in case of using the SXR/EUV plasma source based on the 10J/1ns Nd:YAG laser system is comparable to Ne I and Ne II lines.…”

Section: Photoionized Plasmasmentioning

confidence: 93%

“…X−ray power density in the vicinity of these plas− mas exceeded 10 11 W/cm 2 and was sufficient for the forma− tion of photoionized plasma with high ionization degree. These kinds of experiments were performed using, for ex− ample, the GEKKO XII [4] or Shenguang II [5] high−power laser facilities and also Sandia National Laboratory pulsed− −power Z facility [2,3]. A brief review of interpretation of astrophysical observations, supported by the laboratory as− trophysics experiments, was presented in Ref.…”

Section: Photoionized Plasmasmentioning

confidence: 99%

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Laser-plasma extreme ultraviolet and soft X-ray sources based on a double stream gas puff target: interaction of the radiation pulses with matter

Bartnik

2015

Opto-Electronics Review

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In this work a review of investigations concerning interaction of intense extreme ultraviolet (EUV) and soft X-ray (SXR) pulses with matter is presented. The investigations were performed using laser-produced plasma (LPP) EUV/SXR sources based on a double stream gas puff target. The sources are equipped with dedicated collectors allowing for efficient focusing of the EUV/SXR radiation pulses. Intense radiation in a wide spectral range, as well as a quasi-monochromatic radiation can be produced. In the paper different kinds of LPP EUV/SXR sources developed in the Institute of Optoelectronics, Military University of Technology are described.Radiation intensities delivered by the sources are sufficient for different kinds of interaction experiments including EUV/SXR induced ablation, surface treatment, EUV fluorescence or photoionized plasma creation. A brief review of the main results concerning this kind of experiments performed by author of the paper are presented. However, since the LPP sources cannot compete with large scale X-ray sources like synchrotrons, free electron lasers or high energy density plasma sources, it was indicated that some investigations not requiring extreme irradiation parameters can be performed using the small scale installations. Some results, especially concerning low temperature photoionized plasmas are very unique and could be hardly obtained using the large facilities.

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“…They are also found in cometary environments, in asteroid spectra and in interplanetary dust particles. Accurate interpretation of their absorption lines requires detailed theoretical models [67].…”

Section: The Boundary Of the Radiative/convective Zones Of The Sunmentioning

confidence: 99%

Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stellar applications. The essential role of laboratory experiments to check the quality of the computed data is underlined. We review some X-ray and XUV laser and Z-pinch photo-absorption measurements as well as X-ray emission spectroscopy experiments involving hot dense plasmas produced by ultra-high-intensity laser irradiation. The measured spectra are systematically compared with the fine-structure opacity code SCO-RCG. The focus is on iron, due to its crucial role in understanding asteroseismic observations of β Cephei-type and Slowly Pulsating B stars, as well as of the Sun. For instance, in β Cephei-type stars, the iron-group opacity peak excites acoustic modes through the "kappa-mechanism". Particular attention is paid to the higher-than-predicted iron opacity measured at the Sandia Z-machine at solar interior conditions. We discuss some theoretical aspects such as density effects, photo-ionization, autoionization or the "filling-the-gap" effect of highly excited states.

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Opacity Studies of Silicon in Radiatively Heated Plasma

Cited by 30 publications

References 43 publications

K-shell energy levels and radiative rates for transitions in Si xi

K-shell energy levels and radiative rates for transitions in Si xi

Laser-plasma extreme ultraviolet and soft X-ray sources based on a double stream gas puff target: interaction of the radiation pulses with matter

Detailed Opacity Calculations for Astrophysical Applications

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