Analysis of ion radiation characteristics in the middle and late stages of laser-produced Cd plasma evolution in vacuum

Bakhiet, Mohammedelnazier; Su, Maogen; Cao, Shiquan; Wu, Yanhong; Li, Maijuan; Dong, Chenzhong

doi:10.1016/j.jqsrt.2021.107535

Cited by 1 publication

(2 citation statements)

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“…Extreme ultraviolet (EUV) emissions from highly charged ions play an important role in the study of a wide variety of astrophysical and laboratory plasmas [1][2][3][4][5][6][7][8][9], particularly for laser-produced plasmas, fusion devices and electron beam ion traps (EBITs). The lines observed in the EUV spectra unveil information about plasma characteristics, viz., electron temperature, ion density and chemical composition.…”

Section: Introductionmentioning

confidence: 99%

“…EUV emissions from highly charged tin ions in laser-produced plasma are used in state-of-the-art nanolithography [4,6,7]. Cd ions are of huge interest in Tokamak fusion research [5] like several other fifth row elements of the periodic table. Moreover, Ge-like ions with closed n = 3 core and four valence electrons are excellent candidates for testing strong electron correlation effects on closely spaced levels in heavy open-shell atoms.…”

Section: Introductionmentioning

confidence: 99%

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Electron Impact Excitation of Ge-like Te20+–Cd16+ Ions

Malker

Sharma

2022

Atoms

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We study electron impact excitation of dipole allowed transitions in the extreme ultraviolet range—8–55 nm—for the germanium isoelectronic sequence Te20+–Cd16+. The fine structure transitions between the ground state having configuration 4s24p2 and the excited states with configurations 4s4p3 and 4s24p4d are considered for these ions. We employ the relativistic distorted wave method to calculate the excitation cross sections in the incident electron energy range from the excitation threshold to 5000 eV. To obtain the required ionic bound state wavefunctions we have used the multi-configuration Dirac-Fock method with correlations within the n = 5 complexes as well as performed relativistic configuration interaction calculations to include the quantum electrodynamic effects. The accuracy of these wavefunctions is established by comparing our calculated wavelengths and oscillator strengths of the considered transitions with the previously reported measurements and other available theoretical results. We also provide the fitting parameters of the calculated cross sections and the excitation rate coefficients for their direct applications in plasma modeling.

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