Electron-impact ionization of Se/sup 24+/

Moores, D L; Reed, K J

doi:10.1103/PhysRevA.39.1747

Title: Electron-impact ionization of Se/sup 24+/

Full Record
Other Related Research

Abstract

Cross sections for electron-impact ionization of neonlike selenium have been calculated using close-coupling wave functions. We report cross sections for ionization of the 2s/sup 2/2p/sup 6/ /sup 1/S ground state and the 2s/sup 2/2p/sup 5/3s /sup 3/P excited state of the ion. We found numerous resonances in the ejected electron channels due to excitation of 2s/sup 2/2p/sup 4/3snl autoionizing states. The resonances are very narrow, but some have peaks that are several orders of magnitude above the nonresonant background cross section. Even with radiative decay taken into account, the resonances enhance the total integrated cross section by nearly a factor of 4.

Authors:: Moores, D L; Reed, K J

Publication Date:: Wed Feb 15 00:00:00 EST 1989

Research Org.:: High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550

OSTI Identifier:: 6436931

Resource Type:: Journal Article

Journal Name:: Phys. Rev. A; (United States)

Additional Journal Information:: Journal Volume: 39:4

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; SELENIUM IONS; ELECTRON-ION COLLISIONS; AUTOIONIZATION; CROSS SECTIONS; EXCITED STATES; GROUND STATES; IONIZATION; RESONANCE; CHARGED PARTICLES; COLLISIONS; ELECTRON COLLISIONS; ENERGY LEVELS; ION COLLISIONS; IONS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats


                    Moores, D L, and Reed, K J. Electron-impact ionization of Se/sup 24+/.  United States: N. p., 1989. 
        Web.  doi:10.1103/PhysRevA.39.1747.

Copy to clipboard


                    Moores, D L, & Reed, K J. Electron-impact ionization of Se/sup 24+/.  United States.  https://doi.org/10.1103/PhysRevA.39.1747

Copy to clipboard


                    Moores, D L, and Reed, K J. 1989.  
        "Electron-impact ionization of Se/sup 24+/".  United States.  https://doi.org/10.1103/PhysRevA.39.1747.

Copy to clipboard


                    
@article{osti_6436931,

  title        = {Electron-impact ionization of Se/sup 24+/},

  author       = {Moores, D L and Reed, K J},

  abstractNote = {Cross sections for electron-impact ionization of neonlike selenium have been calculated using close-coupling wave functions. We report cross sections for ionization of the 2s/sup 2/2p/sup 6/ /sup 1/S ground state and the 2s/sup 2/2p/sup 5/3s /sup 3/P excited state of the ion. We found numerous resonances in the ejected electron channels due to excitation of 2s/sup 2/2p/sup 4/3snl autoionizing states. The resonances are very narrow, but some have peaks that are several orders of magnitude above the nonresonant background cross section. Even with radiative decay taken into account, the resonances enhance the total integrated cross section by nearly a factor of 4.},

  doi          = {10.1103/PhysRevA.39.1747},

  url          = {https://www.osti.gov/biblio/6436931},
  journal      = {Phys. Rev. A; (United States)},
number       = ,

  volume       = 39:4,

  place        = {United States},

  year         = {Wed Feb 15 00:00:00 EST 1989},

  month        = {Wed Feb 15 00:00:00 EST 1989}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1103/PhysRevA.39.1747

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Distorted-wave calculations of the electron-impact ionization of highly ionized Na-like ions

Journal Article Griffin, D; Pindzola, M; Bottcher, C - Phys. Rev. A; (United States)

We report on distorted-wave calculations of the electron-impact ionization cross sections and rate coefficients for the Na-like ions Ti/sup 11+/, Cr/sup 13+/, Fe/sup 15+/, and Ni/sup 17+/. The cross sections for direct ionization out of the 3s, 2p, and 2s subshells were determined using the configuration-average, distorted-wave approximation. In addition, excitation-autoionization contributions originating from inner-shell excitations of the type 2s/sup 2/2p/sup 6/3s..-->..2s/sup 2/2p/sup 5/3snl (n = 3,4,5) and 2s/sup 2/2p/sup 6/3s ..-->..2s2p/sup 6/3snl (n = 3,4) were calculated by employing the distorted-wave approximation and configuration-interaction, bound-state wave functions. Near threshold, the total-ionization cross sections in all four ions are enhancedmore »« less
https://doi.org/10.1103/PhysRevA.36.3642
Correlation enhancement of the electron-impact ionization cross section for excited-state Ne-like ions

Journal Article Pindzola, M; Griffin, D; Bottcher, C - Physical Review, A (General Physics); (USA)

The electron-impact ionization cross section is calculated in the distorted-wave approximation for the Ne-like ions Ar{sup 8+}, Ti{sup 12+}, Fe{sup 16+}, Zn{sup 20+}, and Se{sup 24+}. For ionization from the 2{ital p}{sup 6} ground state, the contributions from inner-shell excitation followed by autoionization are negligible. However, when these ions are initially in the 2{ital p}{sup 5}3s excited configuration, contributions arising from the inner-shell excitations 2{ital p}{sup 5}3s{r arrow}2p{sup 4}3snl and 2{ital p}{sup 5}3s{r arrow}2s2p{sup 5}3snl are large. The overall branching ratio for autoionization of the 2{ital p}{sup 4}3snl and 2{ital s}2{ital p}{sup 5}3snl levels increases when the atomic-structure calculations aremore »« less
https://doi.org/10.1103/PhysRevA.41.1375
Excitation and ionization of highly charged ions by electron impact. Progress report, August 1, 1979-August 31, 1980

Technical Report Sampson, D.

The reduced cross sections Q/sub R//sup H/(nl,u) have been calculated for ionization from the nl = 4s, 4p, 4d and 4f sublevels and the results fitted to simple functions of the impact electron energy u in threshold units. With these values plus those obtained in our earlier work results are now available for all the sublevels 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, and 4f. From the values for Q/sub R//sup H/(nl,u) one can readily obtain the cross section for direct ionization from any of these sublevels in any highly charged complex ion using the simple procedures given inmore »« less
https://doi.org/10.2172/6728868

Full Text Available
Contributions of excitation autoionization to electron-impact ionization of Mg-like Al/sup +/, S/sup 4 +/, Cl/sup 5 +/, and Ar/sup 6 +/ ions

Journal Article Tayal, S; Henry, R - Phys. Rev. A; (United States)

The R-matrix method is used to calculate the contributions of excitation autoionization to electron-impact ionization in Mg-like Al/sup +/, S/sup 4 +/, Cl/sup 5 +/, and Ar/sup 6 +/ ions. The ground 3s/sup 2/ /sup 1/S state together with the autoionizing states arising from the 2p/sup 5/3s/sup 2/3p, 2p/sup 5/3s/sup 2/3d, 2p/sup 5/3s/sup 2/4s, 2s2p/sup 6/3s/sup 2/3p, 2s2p/sup 6/3s/sup 2/3d, and 2s2p/sup 6/3s/sup 2/4s configurations are included in the R-matrix expansion. Large numbers of bound terms of appropriate symmetry are included in the expansion to account for the resonant-excitation--double-autoionization process. The total ionization cross sections are obtained by combining themore »« less
https://doi.org/10.1103/PhysRevA.33.3825
Role of indirect-ionization processes in the electron-impact ionization of Fe/sup 15+/

Journal Article Tayal, S; Henry, R - Phys. Rev. A; (United States)

We have investigated the contributions of excitation-autoionization and resonant-excitation-double-autoionization indirect-ionization processes to the electron-impact ionization of Fe/sup 15+/ using a close-coupling approximation. The total ionization cross sections are obtained by adding the cross sections for these indirect processes to the direct-ionization cross sections. Eleven autoionizing levels arising from the 2p/sup 5/3s/sup 2/, 2p/sup 5/3s3p, 2p/sup 5/3p/sup 2/, and 2p/sup 5/3s3d configurations, together with the ground 2p/sup 6/3s state, are included in the close-coupling expansion. Large numbers of bound terms of appropriate symmetry are included in the expansion to account for the resonant-excitation-double-autoionization process. The present results are in good agreementmore »« less
https://doi.org/10.1103/PhysRevA.39.3890

Similar Records