Multiply-excited states and their contribution to opacity in CO2 laser-driven tin-plasma conditions
Abstract
A recent study (2020 Nat. Commun. 11 2334) has found that transitions between multiply-excited configurations in open 4d-subshell tin ions are the dominant contributors to intense EUV emission from dense, Nd:YAG-driven (laser wavelength λ = 1.064 μm) tin plasmas. In the present study, we employ the Los Alamos Atomic code to investigate the spectral contribution from these transitions under industrially-relevant, CO2 laser-driven (λ = 10.6 μm) tin plasma conditions. First, we employ Busquet's ionisation temperature method to match the average charge state < Z > of a non-local-thermodynamic equilibrium (non-LTE) plasma with an LTE one. This is done by varying the temperature of the LTE calculations until a so-called ionisation temperature TZ is established. Importantly, this approach generates LTE-computed configuration populations in excellent agreement with the non-LTE populations. A corollary of this observation is that the non-LTE populations are well-described by Boltzmann-type exponential distributions having effective temperatures Teff ≈ TZ. In the second part of this work, we perform extensive level-resolved LTE opacity calculations at TZ. It is found that 66% of the opacity in the industrially-relevant 2% bandwidth centred at 13.5 nm arises from transitions between multiply-excited states. These results reinforce the need for the consideration of complex, multiply-excitedmore »
- Authors:
-
[1];
[2];
[3];
[3]
- Advanced Research Center for Nanolithography, Amsterdam (The Netherlands)
- Advanced Research Center for Nanolithography, Amsterdam (The Netherlands); Vrije Univ., Amsterdam (The Netherlands)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); European Research Council (ERC)
- OSTI Identifier:
- 1787292
- Report Number(s):
- LA-UR-20-26756
Journal ID: ISSN 0953-4075; TRN: US2210437
- Grant/Contract Number:
- 89233218CNA000001; 802648
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. B, Atomic, Molecular and Optical Physics
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 3; Journal ID: ISSN 0953-4075
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; opacity; non-LTE; effective temperature; multiply-excited states
Citation Formats
Sheil, John, Versolato, Oscar O., Neukirch, Amanda J., and Colgan, James Patrick. Multiply-excited states and their contribution to opacity in CO2 laser-driven tin-plasma conditions. United States: N. p., 2021.
Web. doi:10.1088/1361-6455/abcedf.
Sheil, John, Versolato, Oscar O., Neukirch, Amanda J., & Colgan, James Patrick. Multiply-excited states and their contribution to opacity in CO2 laser-driven tin-plasma conditions. United States. https://doi.org/10.1088/1361-6455/abcedf
Sheil, John, Versolato, Oscar O., Neukirch, Amanda J., and Colgan, James Patrick. Fri .
"Multiply-excited states and their contribution to opacity in CO2 laser-driven tin-plasma conditions". United States. https://doi.org/10.1088/1361-6455/abcedf. https://www.osti.gov/servlets/purl/1787292.
@article{osti_1787292,
title = {Multiply-excited states and their contribution to opacity in CO2 laser-driven tin-plasma conditions},
author = {Sheil, John and Versolato, Oscar O. and Neukirch, Amanda J. and Colgan, James Patrick},
abstractNote = {A recent study (2020 Nat. Commun. 11 2334) has found that transitions between multiply-excited configurations in open 4d-subshell tin ions are the dominant contributors to intense EUV emission from dense, Nd:YAG-driven (laser wavelength λ = 1.064 μm) tin plasmas. In the present study, we employ the Los Alamos Atomic code to investigate the spectral contribution from these transitions under industrially-relevant, CO2 laser-driven (λ = 10.6 μm) tin plasma conditions. First, we employ Busquet's ionisation temperature method to match the average charge state < Z > of a non-local-thermodynamic equilibrium (non-LTE) plasma with an LTE one. This is done by varying the temperature of the LTE calculations until a so-called ionisation temperature TZ is established. Importantly, this approach generates LTE-computed configuration populations in excellent agreement with the non-LTE populations. A corollary of this observation is that the non-LTE populations are well-described by Boltzmann-type exponential distributions having effective temperatures Teff ≈ TZ. In the second part of this work, we perform extensive level-resolved LTE opacity calculations at TZ. It is found that 66% of the opacity in the industrially-relevant 2% bandwidth centred at 13.5 nm arises from transitions between multiply-excited states. These results reinforce the need for the consideration of complex, multiply-excited states in modelling the radiative properties of laser-driven plasma sources of EUV light.},
doi = {10.1088/1361-6455/abcedf},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
number = 3,
volume = 54,
place = {United States},
year = {Fri Jan 22 00:00:00 EST 2021},
month = {Fri Jan 22 00:00:00 EST 2021}
}
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