Atomic structure considerations for the low-temperature opacity of Sn
Abstract
Here, we have begun a preliminary investigation into the opacity of Sn at low temperatures (< 50 eV). The emissivity and opacity of Sn is a crucial factor in determining the utility of Sn in EUV lithography, with numerous industrial implications. To this end, we have been exploring the accuracy of some approximations used in opacity models for the relevant ion stages of Sn (neutral through ~ 18 times ionized). We also find that the use of intermediate-coupling, as compared to full configuration-interaction, is not adequate to obtain accurate line positions of the important bound-bound transitions in Sn. One requires full configuration-interaction to properly describe the strong mixing between the various n=4 sub-shells that give rise to the Δn= 0 transitions that dominate the opacity spectrum at low temperatures. Furthermore, since calculations that include full configuration-interaction for large numbers of configurations quickly become computationally prohibitive, we have explored hybrid calculations, in which full configuration-interaction is retained for the most important transitions, while intermediate-coupling is employed for all other transitions. After extensive exploration of the atomic structure properties, local-thermodynamic-equilibrium (LTE) opacities are generated using the ATOMIC code at selected temperatures and densities and compared to experiment.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Kansas State Univ., Manhattan, KS (United States). J.R. Macdonald Lab.
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1352383
- Alternate Identifier(s):
- OSTI ID: 1419534
- Report Number(s):
- LA-UR-17-21866
Journal ID: ISSN 1574-1818; TRN: US1700562
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- High Energy Density Physics
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: C; Journal ID: ISSN 1574-1818
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; opacity
Citation Formats
Colgan, J., Kilcrease, D. P., Abdallah, J., Sherrill, M. E., Fontes, C. J., Hakel, P., and Armstrong, G. S. J. Atomic structure considerations for the low-temperature opacity of Sn. United States: N. p., 2017.
Web. doi:10.1016/j.hedp.2017.03.009.
Colgan, J., Kilcrease, D. P., Abdallah, J., Sherrill, M. E., Fontes, C. J., Hakel, P., & Armstrong, G. S. J. Atomic structure considerations for the low-temperature opacity of Sn. United States. https://doi.org/10.1016/j.hedp.2017.03.009
Colgan, J., Kilcrease, D. P., Abdallah, J., Sherrill, M. E., Fontes, C. J., Hakel, P., and Armstrong, G. S. J. 2017.
"Atomic structure considerations for the low-temperature opacity of Sn". United States. https://doi.org/10.1016/j.hedp.2017.03.009. https://www.osti.gov/servlets/purl/1352383.
@article{osti_1352383,
title = {Atomic structure considerations for the low-temperature opacity of Sn},
author = {Colgan, J. and Kilcrease, D. P. and Abdallah, J. and Sherrill, M. E. and Fontes, C. J. and Hakel, P. and Armstrong, G. S. J.},
abstractNote = {Here, we have begun a preliminary investigation into the opacity of Sn at low temperatures (< 50 eV). The emissivity and opacity of Sn is a crucial factor in determining the utility of Sn in EUV lithography, with numerous industrial implications. To this end, we have been exploring the accuracy of some approximations used in opacity models for the relevant ion stages of Sn (neutral through ~ 18 times ionized). We also find that the use of intermediate-coupling, as compared to full configuration-interaction, is not adequate to obtain accurate line positions of the important bound-bound transitions in Sn. One requires full configuration-interaction to properly describe the strong mixing between the various n=4 sub-shells that give rise to the Δn= 0 transitions that dominate the opacity spectrum at low temperatures. Furthermore, since calculations that include full configuration-interaction for large numbers of configurations quickly become computationally prohibitive, we have explored hybrid calculations, in which full configuration-interaction is retained for the most important transitions, while intermediate-coupling is employed for all other transitions. After extensive exploration of the atomic structure properties, local-thermodynamic-equilibrium (LTE) opacities are generated using the ATOMIC code at selected temperatures and densities and compared to experiment.},
doi = {10.1016/j.hedp.2017.03.009},
url = {https://www.osti.gov/biblio/1352383},
journal = {High Energy Density Physics},
issn = {1574-1818},
number = C,
volume = 23,
place = {United States},
year = {Fri Mar 31 00:00:00 EDT 2017},
month = {Fri Mar 31 00:00:00 EDT 2017}
}
Web of Science
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Works referencing / citing this record:
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