Excitation cross sections of theH2(XΣg+1→bΣu+3) by the combined close-coupling—R-matrix method

1982 ◽  
Vol 26 (4) ◽  
pp. 1852-1857 ◽  
Author(s):  
Thomas K. Holley ◽  
Sunggi Chung ◽  
Chun C. Lin ◽  
Edward T. P. Lee
Keyword(s):  
Cross Sections ◽  
Matrix Method ◽  
Close Coupling ◽  
R Matrix ◽  
Excitation Cross Sections

Relativistic R-matrix close-coupling method based on the effective many-body Hamiltonian: electron-impact excitation of the 3s2 1S0–3s3p1P1o electric dipole-allowed transition of the Ar6+ ion1This article is part of a Special Issue on the 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas.

2011 ◽  
Vol 89 (4) ◽  
pp. 457-463
Author(s):  
Juan A. Santana ◽  
Yasuyuki Ishikawa
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Electric Dipole ◽  
Coupling Method ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Many Body ◽  
Close Coupling ◽  
R Matrix ◽  
Excitation Cross Sections

Electron-impact excitation cross sections of the electric dipole-allowed 3s2 1S0–3s3p [Formula: see text] transition in Mg-like argon (Ar6+) are calculated using the configuration-interaction and effective many-body Hamiltonian R-matrix close-coupling methods. The near-threshold electron-impact excitation cross sections computed with the effective many-body Hamiltonian R-matrix close-coupling method are in good agreement with the benchmark experimental results.

scholarly journals Electron Scattering Cross-Section Calculations for Atomic and Molecular Iodine

Atoms ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 103
Author(s):  
Harindranath Ambalampitiya ◽  
Kathryn Hamilton ◽  
Oleg Zatsarinny ◽  
Klaus Bartschat ◽  
Matt Turner ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Electron Attachment ◽  
Molecular Iodine ◽  
Close Coupling ◽  
R Matrix ◽  
Local Complex ◽  
Excitation Cross Sections ◽  
Ionization Cross Sections

Cross sections for electron scattering from atomic and molecular iodine are calculated based on the R-matrix (close-coupling) method. Elastic and electronic excitation cross sections are presented for both I and I2. The dissociative electron attachment and vibrational excitation cross sections of the iodine molecule are obtained using the local complex potential approximation. Ionization cross sections are also computed for I2 using the BEB model.

Photoionization of ground 1s2 2s2 2p6 1Se0 and excited 1s2 2S22p53S 3Po0,1,2 states of Si V using relativistic Breit–Pauli R-matrix method

2006 ◽  
Vol 84 (8) ◽  
pp. 707-715 ◽  
Author(s):  
AK S Jha ◽  
N Singh ◽  
N Verma ◽  
M Mohan
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Configuration Interaction ◽  
Matrix Method ◽  
Relativistic Effects ◽  
Wave Functions ◽  
Close Coupling ◽  
R Matrix ◽  
Matrix Expansion ◽  
Target States

The close-coupling R-matrix method has been used to calculate photoionization cross sections for the ground and the lowest three excited states using the relativistic Breit–Pauli approximation. Configuration interaction wave-functions are used to represent eleven lowest LSJ target states of Si VI retained in the R-matrix expansion. Relativistic effects are clearly revealed from resonance converging on the excited states of Si VI.PACS No.: 32.80.Fb

scholarly journals Relativistic B-Spline R-Matrix Calculations for Electron Collisions with Ytterbium

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 47
Author(s):  
Kathryn R. Hamilton ◽  
Klaus Bartschat ◽  
Oleg Zatsarinny
Keyword(s):  
Experimental Data ◽  
Electron Scattering ◽  
Cross Sections ◽  
Matrix Method ◽  
Model Potential ◽  
Electron Collisions ◽  
R Matrix ◽  
B Spline ◽  
Potential Approach

We have applied the full-relativistic Dirac B-Spline R-matrix method to obtain cross sections for electron scattering from ytterbium atoms. The results are compared with those obtained from a semi-relativistic (Breit-Pauli) model-potential approach and the few available experimental data.

Photoionization of Al X from ground state using the relativistic R-matrix close-coupling method

2014 ◽  
Vol 92 (3) ◽  
pp. 241-245 ◽  
Author(s):  
Liang Liang ◽  
Xu-yang Liu ◽  
Chao Zhou
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Energy Levels ◽  
Resonance Energy ◽  
Photoionization Cross Section ◽  
Rydberg Series ◽  
Close Coupling ◽  
R Matrix ◽  
Target States ◽  
Distorted Wave Method

The relativistic R-matrix method is used to calculate the total photoionization cross sections from the ground state 1s22s2 1S0 of Al X for photon energies ranges from the first ionization threshold to just above the eighth threshold of the residual ion Al XI. In this work, the relativistic distorted-wave method is employed to calculate the fine-structure energy levels and radial functions. The lowest eight level target states of Al XI are used in the photoionization calculations of Al X and should provide a reasonably complete database for practical application for photoionization cross section for Al X. The resonance energy levels and widths of 18 Rydberg series have been investigated.

scholarly journals Partial Photoionization Cross Sections of Chromium from the Ground and Excited States

Atoms ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 51
Author(s):  
Oleg Zatsarinny ◽  
Swaraj Tayal
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Bound States ◽  
Close Coupling ◽  
R Matrix ◽  
Hartree Fock ◽  
Nonresonant Background ◽  
Ionic States ◽  
Matrix Calculation

Partial and total photoionization cross sections of iron-peak elements are important for the determination of abundances in late-type stars and nebular objects. We have investigated photoionization of neutral chromium from the ground and excited states in the low energy region from the first ionization threshold at 6.77 eV to 30 eV. Accurate descriptions of the initial bound states of Cr I and the final residual Cr II ionic states have been obtained in the multiconfiguration Hartree-Fock method together with adjustable configuration expansions and term-dependent non-orthogonal orbitals. The B-spline R-matrix method has been used for the calculation of photoionization cross sections. The 194 LS final ionic states of Cr II 3d44s, 3d34s2, 3d5, 3d44p, and 3d34s4p principal configurations have been included in the close-coupling expansion. The inclusion of all terms of these configurations has significant impact on the near-threshold resonance structures as well as on the nonresonant background cross sections. Total photoionization cross sections from the ground 3d54sa7S and excited 3d54sa5S, 3d44s2a5D, 3d54pz5P, and 3d44s4py5P states of Cr I have been compared with other available R-matrix calculation to estimate the likely uncertainties in photoionization cross sections. We analyzed the partial photoionization cross sections for leaving the residual ion in various states to identify the important scattering channels, and noted that 3d electron ionization channel becomes dominant at higher energies.

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