Improved electron collisional line broadening for low-temperature ions and neutrals in plasma modeling

Johns, H. M.; Kilcrease, D. P.; Colgan, J.; Judge, E. J.; Barefield II, J. E.; Wiens, R. C.; Clegg, S. M.

doi:10.1088/0953-4075/48/22/224009

Title: Improved electron collisional line broadening for low-temperature ions and neutrals in plasma modeling

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Abstract

In this study, electron collisional broadening of observed spectral lines depends on plasma electron temperature and density. Including this effect in models of measured spectra is necessary to determine plasma conditions; however, computational limits make accurate line broadening treatments difficult to implement in large-scale plasma modeling efforts. In this paper, we report on improvements to the treatment of electron collisional line broadening and illustrate this with calculations using the Los Alamos ATOMIC code. We implement the Dimitrijevic and Konjevic modified semi-empirical model Dimitrijevic and Konjevic (1986 Astron. and Astrophy. 163 297 and 1987 Astron. Astrophys. 172 345), which we amend by employing oscillator strengths from Hartree–Fock calculations. This line broadening model applies to near-neutral plasmas with electron temperatures of Te ~ 1 eV and electron densities of N_e ~10¹⁷ cm^-3. We evaluate the D.K.-inspired model against the previous hydrogenic approach in ATOMIC through comparison to NIST-rated measurements for selected neutral and singly-ionized Ca, O, Fe, and Sn lines using both fine-structure and configuration-averaged oscillator strengths. The new D.K.-inspired model is significantly more accurate than the previous hydrogenic model and we find the use of configuration-averaged oscillator strengths a good approximation for applications such as LIBS (laser induced breakdown spectroscopy), formore »« less

Authors:

Johns, H. M. ^[1]; Kilcrease, D. P. ^[1]; Colgan, J. ^[1]; Judge, E. J. ^[1]; Barefield II, J. E. ^[1]; Wiens, R. C. ^[1]; Clegg, S. M. ^[1]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Publication Date:: Tue Sep 29 00:00:00 EDT 2015

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1233549

Alternate Identifier(s):: OSTI ID: 1342267

Report Number(s):: LA-UR-15-23919
Journal ID: ISSN 0953-4075; TRN: US1600379

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physics. B, Atomic, Molecular and Optical Physics

Additional Journal Information:: Journal Volume: 48; Journal Issue: 22; Journal ID: ISSN 0953-4075

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; LIBS; stark broadening; ATOMIC; CATS; NIST Atomic Spectral Database; line broadening

Citation Formats


                    Johns, H. M., Kilcrease, D. P., Colgan, J., Judge, E. J., Barefield II, J. E., Wiens, R. C., and Clegg, S. M. Improved electron collisional line broadening for low-temperature ions and neutrals in plasma modeling.  United States: N. p., 2015. 
Web.  doi:10.1088/0953-4075/48/22/224009.

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                    Johns, H. M., Kilcrease, D. P., Colgan, J., Judge, E. J., Barefield II, J. E., Wiens, R. C., & Clegg, S. M. Improved electron collisional line broadening for low-temperature ions and neutrals in plasma modeling.  United States.  https://doi.org/10.1088/0953-4075/48/22/224009

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                    Johns, H. M., Kilcrease, D. P., Colgan, J., Judge, E. J., Barefield II, J. E., Wiens, R. C., and Clegg, S. M. Tue .  
"Improved electron collisional line broadening for low-temperature ions and neutrals in plasma modeling".  United States.  https://doi.org/10.1088/0953-4075/48/22/224009.  https://www.osti.gov/servlets/purl/1233549.

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@article{osti_1233549,

  title        = {Improved electron collisional line broadening for low-temperature ions and neutrals in plasma modeling},

  author       = {Johns, H. M. and Kilcrease, D. P. and Colgan, J. and Judge, E. J. and Barefield II, J. E. and Wiens, R. C. and Clegg, S. M.},

  abstractNote = {In this study, electron collisional broadening of observed spectral lines depends on plasma electron temperature and density. Including this effect in models of measured spectra is necessary to determine plasma conditions; however, computational limits make accurate line broadening treatments difficult to implement in large-scale plasma modeling efforts. In this paper, we report on improvements to the treatment of electron collisional line broadening and illustrate this with calculations using the Los Alamos ATOMIC code. We implement the Dimitrijevic and Konjevic modified semi-empirical model Dimitrijevic and Konjevic (1986 Astron. and Astrophy. 163 297 and 1987 Astron. Astrophys. 172 345), which we amend by employing oscillator strengths from Hartree–Fock calculations. This line broadening model applies to near-neutral plasmas with electron temperatures of Te ~ 1 eV and electron densities of Ne ~1017 cm-3. We evaluate the D.K.-inspired model against the previous hydrogenic approach in ATOMIC through comparison to NIST-rated measurements for selected neutral and singly-ionized Ca, O, Fe, and Sn lines using both fine-structure and configuration-averaged oscillator strengths. The new D.K.-inspired model is significantly more accurate than the previous hydrogenic model and we find the use of configuration-averaged oscillator strengths a good approximation for applications such as LIBS (laser induced breakdown spectroscopy), for which we demonstrate the use of the D.K.-inspired model.},

  doi          = {10.1088/0953-4075/48/22/224009},

  journal      = {Journal of Physics. B, Atomic, Molecular and Optical Physics},

  number       = 22,

  volume       = 48,

  place        = {United States},

  year         = {Tue Sep 29 00:00:00 EDT 2015},

  month        = {Tue Sep 29 00:00:00 EDT 2015}

}

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