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| molecules:ism:hcxn-plus [2024/07/31 16:08] – mueller | molecules:ism:hcxn-plus [2024/07/31 16:17] (current) – mueller |
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| **[[https://doi.org/10.1051/0004-6361/202451081|Discovery of the interstellar cyanoacetylene radical cation HC3N+]]**\\ | **[[https://doi.org/10.1051/0004-6361/202451081|Discovery of the interstellar cyanoacetylene radical cation HC3N+]]**\\ |
| //Astron. Astrophys.// **687**, Art. No. L22 (2024).\\ | //Astron. Astrophys.// **687**, Art. No. L22 (2024).\\ |
| The QUIJOTE survey of TMC-1 was employed once more to identify the six strong hyperfine structure components of the //J// = 7/2 − 5/2 near 31.63 GHz and 9/2 − 7/2 near 40.66 GHz in its <sup>2</sup>Π<sub>3/2</sub> lower spin ladder with good signal-to-noise ratio. The HFS components where not or only slightly blended with the exception of one in the upper transition. Supporting, but less favorable results were presented for the 11/2 − 9/2 transition near 49.965 GHz.\\ | The QUIJOTE survey of TMC-1 was employed once more to identify the six strong hyperfine structure components of the //J// = 7/2 − 5/2 near 31.63 GHz and 9/2 − 7/2 near 40.66 GHz in its <sup>2</sup>Π<sub>3/2</sub> lower spin ladder with good signal-to-noise ratio. The HFS components where not or only slightly blended with the exception of one in the upper transition. Supporting, but less favorable results were presented for the 11/2 − 9/2 transition near 49.965 GHz. The rotational temperature was estimated to be 4.5 K. The HC<sub>3</sub>N to HC<sub>3</sub>N<sup>+</sup> ratio is about 3200; the C<sub>3</sub>N to HC<sub>3</sub>N<sup>+</sup> ratio about 300; the HC<sub>3</sub>N<sup>+</sup> to HC<sub>5</sub>N<sup>+</sup> ratio is about 0.6.\\ |
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