scholarly journals Classification of the 5p5nln'l' LSJ energy levels of Cs excited by 30 eV electrons

2015 ◽  
Vol 55 (2) ◽  
Author(s):  
Gintaras Kerevičius ◽  
Alicija Kupliauskienė
Keyword(s):  
Cross Sections ◽  
Electron Spectrum ◽  
Large Scale ◽  
Energy Levels ◽  
Coupling Scheme ◽  
Excitation Threshold ◽  
Angular Momenta ◽  
Excitation Cross Sections ◽  
Configuration Interaction Calculations

Theoretical investigation of the 5p5 nl(L1S1)n'l' LSJ autoionizing states of Cs was performed by using large scale configuration interaction calculations of energy levels, autoionization probabilities and excitation cross sections obtained in the Dirac–Fock–Slater approximation. Classification of calculated energy levels in the LSJ coupling scheme of angular momenta and simulation of the intensities of ejected Auger electron spectrum were performed. The classified energy levels in the region from the excitation threshold up to 17.365 eV and simulated intensity spectrum were used for identification of the experimental ejected-electron spectrum of Cs excited by 30 eV electrons.

scholarly journals Theoretical study of 4p5nln'l'LSJstates of Sr ion excited by electron impact on Sr atom

2018 ◽  
Vol 58 (3) ◽  
Author(s):  
Alicija Kupliauskienė
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Large Scale ◽  
Energy Levels ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Configuration Interaction Method ◽  
Excitation Cross Sections ◽  
First Time ◽  
Autoionizing States

Calculations of energy levels and electron-impact excitation cross sections of the Auger autoionizing states 4p5nln'l'(nl= 4d, 5s, 5p; n'l'= 4d, 5s, 5p, 5d, 6s, 6p, 6d, 7s, 7p) of Sr ion were performed. A large-scale configuration interaction method on the basis of the solutions of Dirac–Fock–Slater equations was used. The cross sections of electron-impact simultaneous ionization and excitation, and Auger decay of the electron-impact excited states of Sr atom to the 4p-core excited autoionizing states of Sr ion were calculated for the first time and used to estimate the intensity of ejected electron lines. Tentative identification of the Auger electron lines of Sr ion registered in a number of experiments is presented.

scholarly journals Intensities in Complex Spectra of Highly Ionized Atoms

1984 ◽  
Vol 86 ◽  
pp. 44-44
Author(s):  
M. Klapisch ◽  
A. Bar-Shalom ◽  
A. Cohen
Keyword(s):  
Cross Sections ◽  
Wave Functions ◽  
Coupling Scheme ◽  
Distorted Wave ◽  
Intermediate Coupling ◽  
Potential Wave ◽  
Excitation Cross Sections ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Efficient Program

We describe a package of programs for the implementation of the collisional-radiative model to complex configurations. The number of levels taken into account may be several hundreds. The heart of the package is a very efficient program for excitation cross sections in the Distorted Wave framework, using the Relativistic Parametric Potential wave functions. The basic jj coupling scheme actually simplified the computations, enabling a useful factorization into radial and angular parts. Intermediate coupling and configuration interactions are accounted for. We computed ratios of intensities of 3d9 − 3d84s (E2) to 3d9 −3d84p (El) transitions as functions of ne and Te in Xe XXVIII and other Co-like spectra. The atomic model involves all the levels of configurations (3p6)3d9; −3d84s, −3d84p, −3d84d, −3d84f, and (3p5) −3d10, −3d94p. (275 levels) and all the transitions between them. Results compare very well with experimental spectra from TFR.

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

Atoms ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 76
Author(s):  
Aloka Kumar Sahoo ◽  
Lalita Sharma
Keyword(s):  
Electron Impact ◽  
Electron Energy ◽  
Cross Sections ◽  
Energy Levels ◽  
Ultra Violet ◽  
High Energy ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation ◽  
Excitation Threshold

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.

Excitation of H2O+ in e–H2O collisions

1996 ◽  
Vol 74 (5-6) ◽  
pp. 267-278 ◽  
Author(s):  
A. N. Kuchenev ◽  
Yu. M. Smirnov
Keyword(s):  
Cross Sections ◽  
Optical Radiation ◽  
Visible Region ◽  
Optical Excitation ◽  
Inelastic Collisions ◽  
Excitation Threshold ◽  
Excitation Functions ◽  
Excitation Cross Sections

Inelastic collisions, between electrons of low and medium energies and H2O molecules, that give rise to the appearance of optical radiation were studied. An experiment was performed with a gas-filled cell using an extended beam of monokinetic electrons to excite the molecules. A spectrum appearing in the visible region was identified as belonging to H2O+. About 430 excitation cross sections attributed to 10 subbands of the [Formula: see text] system were measured. For a number of lines, measurements were made of the optical excitation functions in the range of energies from the excitation threshold to 200 eV.

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

2020 ◽  
Vol 34 (26) ◽  
pp. 2050241
Author(s):  
Neelam Shukla ◽  
Rajesh Srivastava
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Cross Sections ◽  
Matrix Theory ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Excitation Threshold ◽  
Plasma Modeling ◽  
Excitation Cross Sections ◽  
Density Matrix Theory

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.

scholarly journals Argon ion excitation by relativistic electrons: I. Collision cross sections and deposition efficiencies

1990 ◽  
Vol 8 (3) ◽  
pp. 493-506 ◽  
Author(s):  
D. B. McGarrah ◽  
M. L. Brake
Keyword(s):  
Cross Sections ◽  
Born Approximation ◽  
Energy Levels ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Relativistic Electrons ◽  
Fast Electrons ◽  
Excitation Cross Sections ◽  
Argon Ion ◽  
State Configuration

Calculations of the electron impact excitation cross sections and deposition efficiencies for singly ionized argon with electrons of energies up to and including relativistic values have been made using the first Born approximation and the generalized oscillator formalism. Deposition efficiencies for fast electrons were generated from the Peterson and Green integral equation. Cross sections and efficiencies were produced for 29 transitions from the ground state configuration of Arii to excited energy levels with (Ne)3s23p44s and (Ne)3s23p43d configurations and for 40 transitions between excited energy levels from 4s and 3d to 4p orbitals. Efficiencies are constant for electron energies above 1 keV to 10 MeV. Electrons ejected from inner shells contribute up to 12% of the efficiency of the transition for electrons above 10 keV.

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