Electron Density Dependence of Extreme Ultraviolet Line Intensity Ratios in Ar XIV

The variation of theoretical line intensity ratios with electron density for Mg VI ion are presented. This study indicates that the line intensity ratios for Mg VI can be used to infer electron density for solar plasma.

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X-ray Lines From Mg VIII and Si X Ions and Their Diagnostic Use

International Astronomical Union Colloquium ◽

10.1017/s0252921100012094 ◽

1990 ◽

Vol 115 ◽

pp. 40-43

Author(s):

Bhola N. Dwivedi

Keyword(s):

Electron Density ◽

Line Intensity ◽

Coronal Holes ◽

Emission Lines ◽

X Ray ◽

Quiet Sun ◽

Diagnostic Use ◽

Line Intensity Ratio ◽

Theoretical Line ◽

Intensity Ratios

AbstractThe solar X-ray emission lines from Mg VIII and Si X ions have been studied. The variation of theoretical line intensity ratio I(λ 75.03)/I(λ 74.86) from Mg VIII and I(λ 50.69)/I(λ 50.52) from Si X as a function of electron density is found to be good density monitors of the emitting regions of solar plasma. The computed values of line intensity from these ions based on Kopp and Orrall model have been used to derive electron density of the quiet Sun and coronal holes. The electron densities of 109 cm-3 and 4.6 × 108 cm-3 are estimated at the electron temperatures of 8 x 105 K and 1.6 x 106 K for the quiet Sun whereas the respective values of 5.4 x 108 cm-3 and 1.7 x 108 cm-3 are obtained for the coronal holes. The line intensity ratios studied here are independent of temperature variation and are therefore excellent candidates for electron density diagnostics. However, observational data with improved spectral resolution is needed for using X-ray line pairs studied for their diagnostic use.

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EUV Beam-Foil Spectra of Scandium, Vanadium, Chromium, Manganese, Cobalt, and Zinc

Atoms ◽

10.3390/atoms9020023 ◽

2021 ◽

Vol 9 (2) ◽

pp. 23

Author(s):

Elmar Träbert

Keyword(s):

Survey Data ◽

Light Source ◽

Line Intensity ◽

Extreme Ultraviolet ◽

Single Element ◽

Ultraviolet Spectra ◽

Intensity Ratios ◽

Beam Foil

Beam-foil extreme-ultraviolet spectra of Sc, V, Cr, Mn, Co and Zn are presented that provide survey data of a single element exclusively. Various details are discussed in the context of line intensity ratios, yrast transitions, delayed spectra and peculiar properties of the beam-foil light source.

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EUV Beam-Foil Spectra of Titanium, Iron, Nickel, and Copper

Atoms ◽

10.3390/atoms9030045 ◽

2021 ◽

Vol 9 (3) ◽

pp. 45

Author(s):

Elmar Träbert

Keyword(s):

Electron Beam ◽

Line Intensity ◽

Ion Trap ◽

Extreme Ultraviolet ◽

Single Element ◽

Time Resolved ◽

Electron Beam Ion Trap ◽

Iron Nickel ◽

Intensity Ratios ◽

Beam Foil

Beam–foil spectroscopy offers the efficient excitation of the spectra of a single element as well as time-resolved observation. Extreme-ultraviolet (EUV) beam–foil survey and detail spectra of Ti, Fe, Ni, and Cu are presented, as well as survey spectra of Fe and Ni obtained at an electron beam ion trap. Various details are discussed in the context of line intensity ratios, yrast transitions, prompt and delayed spectra, and intercombination transitions.

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