Precise measurements and theoretical calculations of He-like ion resonance line satellites radiated from Be-, B-, C-, N-, O-, and F-like ions

Abstract

Spectra with spectral resolution λ/Δλ ≃ 3000-7000 in the vicinity of the He-like ion resonance lines Mg, Al, Si, P, S were obtained in CO2 laser-produced plasma. The wavelengths of these satellites were measured and compared with numerical calculations. Identification of lines or a group of overlapping lines was performed. Twenty-two transitions of dielectronic satellites for Be-like ions, 41 transitions for B-like, 40 transitions for C-like, 22 transitions for N-like, 12 transitions for O-like ions and 2 transitions for F-like ions were identified. The average between theoretical and experimental wavelengths was ±(0.0005-0.001)Å, but in some cases it was ±(0.002-0.003)Å.

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

“…Our conclusions are supported from comparing our results with the compiled experimental level data from NIST. For the wavelengths, the differences with those of laser experimental measurements (Faenov et al 1994) are lower than 8 mÅ. The large differences of radiative rates for some strong transitions, such as level 34 and 35, are mainly due to the strong spin-orbit interactions between these levels, which suggests that it is important to include relativistic effects in calculations.…”

“…The main reasons are that it is difficult to generate these K-vacancy states since the needed energies are usually higher than the ion ionization energy, and the high auto-ionization rates of these K-vacancy states depress the production of fluorescence yielding, thus these K-lines from Si ix are relatively very weak. The available experimental measurements by Faenov et al (1994) are listed in Table 2. The largest wavelength difference between our FAC6 calculations and those of the experimental results is 8 mÅ, which is consistent with our former work on Si xi (Wei et al 2010).…”

“…A&A 566, A105 (2014) Faenov et al (1994) precisely measured the wavelengths of Be-like to F-like ion K lines generated by laser-produced plasmas and calculated the wavelengths, A-values, and Auger rates with the MZ code (Vainshtein & Safronova 1978, 1980. Recently, Hell (2012) reported the measurements of K-line energies of the L-shell ions of Si using the electron beam ion trap EBIT-I at Lawrence Livermore National Laboratory to determine the Doppler shifts of these lines in Cygnus X-1.…”

Atomic decay data for modeling K lines of iron peak and light odd-Zelements

“…full circles: F-like sequence (N = 9). Experimental data for ions with Z c ≤ 15 are taken from the laser-produced plasma (Faenov et al 1994) and plasma focus discharge in argon (Biémont et al 2000) experiments. EBIT measurements (Beiersdorfer et al 1991;Smith et al 1995;Decaux et al 1997) are considered for ions with Z c > 15.…”

“…For ions with Z c ≤ 15, the experimental wavelengths λ EXP i are taken from the laser-produced plasma experiment of Faenov et al (1994) and the plasma focus discharge in argon of Biémont et al (2000); for ions with Z c > 15, the wavelengths measured using an EBIT are considered (Beiersdorfer et al 1991;Smith et al 1995;Decaux et al 1997). The HFR wavelengths λ HFR i are calculated in this work for phosphorus, vanadium and cobalt; in Palmeri et al (2003a) for iron; in Palmeri et al (2008a) for magnesium, silicon, sulphur and argon and in Palmeri et al (2011) for aluminium.…”