Cyclic C$_4^+$ as the carrier of the diffuse interstellar band at 503.9 nm?
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909545172828160 |
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| author | Krasnokutski, Serge. A. Ganner, Lisa Ončák, Milan Foitzik, Florian Bergmeister, Stefan Zappa, Fabio Scheier, Paul Gruber, Elisabeth |
| author_facet | Krasnokutski, Serge. A. Ganner, Lisa Ončák, Milan Foitzik, Florian Bergmeister, Stefan Zappa, Fabio Scheier, Paul Gruber, Elisabeth |
| contents | The diffuse interstellar bands (DIBs) have remained a mystery in astronomy since their discovery over a century ago. The only currently known carrier is C$_{60}^+$ responsible for five DIBs, while more than 550 are yet to be interpreted. The spectra of short carbon chain cations C$_n^+$, which are considered one of the most promising classes of species for the role of carriers of DIBs, are successfully recorded using He-tagging spectroscopy. The comparison of laboratory spectra with the observations demonstrates a close match of two absorption bands of C$_4^+$ with the broad DIB at 503.9 nm. This defines a high abundance of these ions in the interstellar medium (ISM), which should exceed those of other similar-sized carbon chain cations. It is anticipated that all other short carbon chain cations will exhibit linear geometry and, as a consequence, will have a long vibrational progression. However, the distinctive cyclic geometry of C$_4^+$ is postulated to underpin the elevated abundance of these ions in the ISM, as well as the distinctive spectrum of this ion, which displays a single strong, relatively narrow absorption band that exceeds in intensity all other absorption bands in the visible range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_15725 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cyclic C$_4^+$ as the carrier of the diffuse interstellar band at 503.9 nm? Krasnokutski, Serge. A. Ganner, Lisa Ončák, Milan Foitzik, Florian Bergmeister, Stefan Zappa, Fabio Scheier, Paul Gruber, Elisabeth Astrophysics of Galaxies Atomic and Molecular Clusters The diffuse interstellar bands (DIBs) have remained a mystery in astronomy since their discovery over a century ago. The only currently known carrier is C$_{60}^+$ responsible for five DIBs, while more than 550 are yet to be interpreted. The spectra of short carbon chain cations C$_n^+$, which are considered one of the most promising classes of species for the role of carriers of DIBs, are successfully recorded using He-tagging spectroscopy. The comparison of laboratory spectra with the observations demonstrates a close match of two absorption bands of C$_4^+$ with the broad DIB at 503.9 nm. This defines a high abundance of these ions in the interstellar medium (ISM), which should exceed those of other similar-sized carbon chain cations. It is anticipated that all other short carbon chain cations will exhibit linear geometry and, as a consequence, will have a long vibrational progression. However, the distinctive cyclic geometry of C$_4^+$ is postulated to underpin the elevated abundance of these ions in the ISM, as well as the distinctive spectrum of this ion, which displays a single strong, relatively narrow absorption band that exceeds in intensity all other absorption bands in the visible range. |
| title | Cyclic C$_4^+$ as the carrier of the diffuse interstellar band at 503.9 nm? |
| topic | Astrophysics of Galaxies Atomic and Molecular Clusters |
| url | https://arxiv.org/abs/2503.15725 |