Carbon Swan Molecular Spectra Analyses

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Christian G. Parigger ^{1 ,*}

1 . CGP Consulting LLC, 361 Jack Thomas Drive, Manchester, TN 37355, USA

* Authors to whom correspondence should be addressed.

Published in Journal of Fundamental and Observational Physics and Astrophysics ( Volume 1, Issue 1 )

Received: 16 April 2025 Accepted: 25 May 2025 Published: 22 July 2025

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Abstract

This article presents analysis of carbon Swan, C2, laser-plasma emission records using line strength data, C2-Swan-lsf, and the ExoMol astrophysical database. Line- strength data fitting of 0.25-nanometer spectral resolution ExoMol-computed spec- tra for a 6,000-Kelvin temperature C2 Swan system, d 3 Πg −→ a 3 Πu, ∆v = 0, ±1, reveals a temperature of 5,640 Kelvin. The six per cent lower temperature is as- sociated primarily with the accuracy of the transition wavelengths in the ExoMol vs. C2-Swan-lsf data. The analysis of experiment data examines spectra that are recorded following laser-induced optical breakdown in carbon monoxide. The laser plasma data are recorded with 0.35-nm spectral resolution. The temperature infer- ences are elaborated when using non-linear fitting with both databases. The results show temperatures in excess of 6,000 Kelvin for the ∆v = −1 sequence, and for a time delay of 30 µs from laser plasma initiation. The accuracy of the C2 Swan bands line strength data is of the order of 1 picometer. These line strength data are also utilized for analysis of laser-induced fluorescence experiments that employ a spectral resolution of 5.5 picometer, and a temperature of 2,716 Kelvin is inferred. Accurate C2 databases show many applications in laboratory diagnosis and interpretation of astrophysical plasma records.

Published in	Journal of Fundamental and Observational Physics and Astrophysics (Volume 1, Issue 1)
DOI	registering/gsgfg
Page(s)	10
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s). Published by Open Access Press

Keywords

carbon Swan bands, laser-plasma, molecular spectroscopy, astrophysics

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APA Style

Parigger, C. C. G. (2024). Carbon Swan Molecular Spectra Analyses. Journal of Fundamental and Observational Physics and Astrophysics, 1, (1), 1. https://doi.org/registering/gsgfg

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ACS Style

Parigger, C. G. Carbon Swan Molecular Spectra Analyses. Mach. Learn. Res. (2024), 1, (1), 1. doi: https://doi.org/registering/gsgfg

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AMA Style

Parigger G . Carbon Swan Molecular Spectra Analyses. Mach Learn Res. (2024);1(1):1. doi: https://doi.org/registering/gsgfg

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References

1. Pretty W E 1927 Proc. Phys. Soc. 40 71
2. Johnson R C 1927 Phil. Trans. Royal Soc. A 226 157
3. Phillips J G and Davis S P 1968 The Berkeley Analysis of Molecular Spectra, Vol. 2, I. The Swan system of the C2 molecule (Berkeley: Univ. California Press)