Abstract
In the present work, a detailed study on the electron impact excitation of Xe7+, Xe8+, Xe9+ and Xe10+ ions for the dipole allowed (E1) transitions in the EUV range of 8–19 nm is presented. The multi-configuration Dirac–Fock method is used for the atomic structure calculation including the Breit and QED corrections along with the relativistic configuration interaction approach. We have compared our calculated energy levels, wavelengths and transition rates with other reported experimental and theoretical results. Further, the relativistic distorted wave method is used to calculate the cross sections from the excitation threshold to 3000 eV electron energy. For plasma physics applications, we have reported the fitting parameters of these cross sections using two different formulae for low and high energy ranges. The rate coefficients are also obtained using our calculated cross sections and considering the Maxwellian electron energy distribution function in the electron temperature range from 5 eV to 100 eV.
Highlights
Since emissions from various charged species of xenon ions carry information about the plasma parameters and impurities, their atomic structure and dynamical properties in the extreme ultraviolet (EUV) range are essential for the accurate diagnostics of the aforementioned plasmas
Shen et al [16] used Flexible Atomic Code (FAC), based on a fully relativistic approach, to calculate the energy levels, oscillator strengths, electron impact collision strengths as well as effective collision strengths for Xe10+. It is clear from the above discussion that most of the previous experimental or theoretical studies on Xe7+ –Xe10+ ions have focused on their spectroscopic properties, while the electron impact cross section data are scarcely reported
The atomic wavefunctions of the four ions are used in our relativistic distorted wave (RDW) program to calculate the electron impact excitation cross sections for the E1 transitions in Xe7+ –Xe10+ ions
Summary
Spectroscopic and collisional data of highly charged xenon ions in the extreme ultraviolet (EUV) spectral range play a vital role in several research areas. Observed the transition array 4d8 –(4d7 5p + 4d7 4f + 4p5 4d9 ) of Xe10+ using a low inductance vacuum spark and a 10.7 m grazing incidence photograph in the EUV region 10.5–15.7 nm These lines were analyzed using Hartree–Fock (HFR) calculations in relativistic mode with the help of the Cowan suite of codes [7]. Various theoretical studies have been carried out to report energy levels, wavelengths, oscillator strengths and transition probabilities of xenon ions. Shen et al [16] used Flexible Atomic Code (FAC), based on a fully relativistic approach, to calculate the energy levels, oscillator strengths, electron impact collision strengths as well as effective collision strengths for Xe10+ It is clear from the above discussion that most of the previous experimental or theoretical studies on Xe7+ –Xe10+ ions have focused on their spectroscopic properties, while the electron impact cross section data are scarcely reported. Maxwellian, we have calculated excitation rate coefficients using our cross sections for electron temperature range 5–100 eV
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