Radiative and Auger Decay of K‐Vacancy Levels in the Ne, Mg, Si, S, Ar, and Ca Isonuclear Sequences

Abstract

The HFR and AUTOSTRUCTURE atomic structure codes are used to compute complete data sets of level energies, wavelengths, A-values, and radiative and Auger widths for K-vacancy states of the Ne, Mg, Si, S, Ar, and Ca isonuclear sequences. Ions with electron number N > 9 are treated for the first time. Detailed comparisons with previous measurements and theoretical data for ions with N 9 are carried out in order to estimate reliable accuracy ratings.

Measurement and analysis of K-shell lines of silicon ions in laser plasmas

“…These include using HFR [12] and AUTOSTRUCTURE [13,14] to calculate the wavelength and A-values of K-shell lines for some medium-Z elements. Their results agree well with the other previous works [4,9] , but some disagreements still exist, for example, the difference from C-like ions radiative rates can be 40% [9,11,15] . In order to benchmark and testify the theoretical results, some experiments were carried out to measure the wavelengths of K-shell lines.…”

“…The intense lines in these two cases are listed in Tables 1 and 2. In addition, the available wavelength results of Palmeri et al [9] are also listed in Tables 1 and 2 as comparison. Two groups of data are in good agreement, and the difference of most of the lines is less than 0.01Å.…”

“…Many theoretical calculations [4,[9][10][11] have been performed to derive the wavelengths and transition rates of K-shell lines using kinds of atom structure codes. These include using HFR [12] and AUTOSTRUCTURE [13,14] to calculate the wavelength and A-values of K-shell lines for some medium-Z elements.…”

Laboratory Measurements of the K-Shell Transition Energies in L-Shell Ions of Si and S

“…The results have been compared to our own FAC calculations and earlier calculations of Palmeri et al (2008), Behar & Netzer (2002), and House (1969). The newly available data (Table 3) can directly be applied to resolve astrophysical problems such as, e.g., wind diagnostics in high-mass X-ray binary systems like Vela X-1 (Liedahl & Brown 2008) and Cyg X-1 (Miškovičová et al 2016).…”

“…We identify and measure the energies of 18 and 21 X-ray features from silicon and sulfur, respectively. The results are compared to new Flexible Atomic Code calculations and to semi-relativistic Hartree-Fock calculations by Palmeri et al (2008). These results will be especially useful for wind diagnostics in high-mass X-ray binaries, such as Vela X-1 and Cygnus X-1, where high-resolution spectral measurements using Chandraʼs high-energy transmission grating has made it possible to measure Doppler shifts of -100 km s 1 .…”