Electron-impact excitations of highly charged tungsten ions and polarization study of their successive photon decay

Shukla, Neelam; Priti, Priti; Sharma, Lalita; Srivastava, Rajesh

doi:10.1140/epjd/e2019-100010-9

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…Based on the applications of our RDW method in our recent work [28][29][30][31][32] on electron impact excitation of highly charged…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…We have employed relativistic distorted wave (RDW) method [27] to calculate the electron excitation cross sections in the scattered electron energy range up to 1500 eV. The RDW method has been successfully implemented in our previous work on highly charged ions [28][29][30][31][32]. For the cross section calculations, the wavefunctions of the target ion bound states as well as of the continuum states of the projectile incident and scattered electrons are required.…”

Section: Introductionmentioning

confidence: 99%

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Electron impact excitation of Ge-like to Cu-like xenon ions in the extreme ultraviolet

Bharti

Srivastava

2020

J. Phys. B: At. Mol. Opt. Phys.

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Electron impact excitation of Ge-like (Xe22+) to Cu-like (Xe25+) highly charged xenon ions are studied and dipole allowed fine-structure transitions in the wavelength range 9–25 nm are considered. We use relativistic distorted wave method to calculate the electron excitation cross sections for the different transitions of the four ions in the scattered electron energy range from excitation threshold to 1500 eV. The ionic bound state wavefunctions have been obtained using multi-configuration Dirac–Fock method. To ascertain the accuracy of the wavefunctions, the wavelengths and oscillator strengths of the considered transitions in these ions are calculated and compared with the previously reported measurements and other theoretical calculations, where available. For plasma diagnostic applications, the obtained cross sections are further used to calculate the rate coefficients of the transitions as well as fitted with an analytical expression which can be used in plasma model conveniently.

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“…Based on the applications of our RDW method in our recent work [28][29][30][31][32] on electron impact excitation of highly charged…”

Section: Theoretical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron impact excitation of Ge-like to Cu-like xenon ions in the extreme ultraviolet

Bharti

Srivastava

2020

J. Phys. B: At. Mol. Opt. Phys.

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“…This ensures the quality of the target ion's wavefunctions that are crucial in determining the accuracy of the scattering parameters. Moreover, the RDW method has been successfully implemented in the previous work on a variety of targets from closed to open-shell systems and neutral atoms to multiply or highly charged ions atoms/ions [25][26][27][28][29][30]. It has also been found that using RDW cross sections in a collisional radiative (CR) model provides plasma parameters that are in better agreement with the measurements [31][32][33][34].…”

Section: Cross Sections and Rate Coefficientsmentioning

confidence: 97%

Electron Impact Excitation of Extreme Ultra-Violet Transitions in Xe7–Xe10 Ions

Sahoo

Sharma

2021

Atoms

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In the present work, a detailed study on the electron impact excitation of Xe7+, Xe8+, Xe9+ and Xe10+ ions for the reddipole 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.

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Electron-impact excitation of W40+–W43+ ions: Cross-section and polarization

Shukla

Srivastava

2020

Int. J. Mod. Phys. B

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Electron-impact excitation of tungsten ions [Formula: see text] has been studied using the fully relativistic distorted wave (RDW) theory. The excitation cross-sections of selected electric dipole allowed transitions of these ions to be determined for the incident electron energies from the excitation threshold to 20 keV. Further, the calculated cross-section results are fitted with an analytical expression for direct applications in plasma modeling. In addition, using the density matrix theory, the linear polarization of the photons emitted from the excited tungsten ions when decay to their respective ground states is presented.

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Electron-impact excitations of highly charged tungsten ions and polarization study of their successive photon decay

Cited by 3 publications

References 33 publications

Electron impact excitation of Ge-like to Cu-like xenon ions in the extreme ultraviolet

Electron impact excitation of Ge-like to Cu-like xenon ions in the extreme ultraviolet

Electron Impact Excitation of Extreme Ultra-Violet Transitions in Xe7–Xe10 Ions

Electron-impact excitation of W40+–W43+ ions: Cross-section and polarization

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