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| molecules:ism:c3h-plus [2019/02/25 22:38] – external edit 127.0.0.1 | molecules:ism:c3h-plus [2019/10/22 17:10] – mueller |
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| The linear propynylidynium, C<sub>3</sub>H<sup>+</sup>, was detected with the IRAM 30 m telescope in nine transitions (//J//" = 3 to 11) in the course of a molecular line survey of the Horsehead Nebula in Orion, covering the 3, 2, and 1.3 mm regions, by\\ | The linear propynylidynium, C<sub>3</sub>H<sup>+</sup>, was detected with the IRAM 30 m telescope in nine transitions (//J//" = 3 to 11) in the course of a molecular line survey of the Horsehead Nebula in Orion, covering the 3, 2, and 1.3 mm regions, by\\ |
| J. Pety, P. Gratier, V. Guzmán, E. Roueff, M. Gerin, J. R. Goicoechea, S. Bardeau, A. Sievers, F. Le Petit, J. Le Bourlot, A. Belloche, and D. Talbi,\\ | J. Pety, P. Gratier, V. Guzmán, E. Roueff, M. Gerin, J. R. Goicoechea, S. Bardeau, A. Sievers, F. Le Petit, J. Le Bourlot, A. Belloche, and D. Talbi,\\ |
| **[[http://dx.doi.org/10.1051/0004-6361/201220062|The IRAM-30 m Line Survey of the Horsehead PDR. II. First detection of the //l//-C<sub>3</sub>H<sup>+</sup> Hydrocarbon Cation]]**,\\ | **[[https://doi.org/10.1051/0004-6361/201220062|The IRAM-30 m Line Survey of the Horsehead PDR. II. First detection of the //l//-C<sub>3</sub>H<sup>+</sup> Hydrocarbon Cation]]**,\\ |
| //Astron. Astrophys.// **548**, Art. No. A68 (2012).\\ | //Astron. Astrophys.// **548**, Art. No. A68 (2012).\\ |
| In the absence of laboratory data, the identification was secured through quantum chemical calculations. | In the absence of laboratory data, the identification was secured through quantum chemical calculations. |
| R. C. Fortenberry, X. Huang, T. D. Crawford, and T. J. Lee,\\ | R. C. Fortenberry, X. Huang, T. D. Crawford, and T. J. Lee,\\ |
| however, proposed\\ | however, proposed\\ |
| **[[http://dx.doi.org/10.1088/2041-8205/768/2/L25|High-accuracy Quartic Force Field Calculations for the Spectroscopic Constants and Vibrational Frequencies of 1 <sup>1</sup>//A'// //l//-C<sub>3</sub>H<sup>–</sup>: A Possible Link to Lines Observed in the Horsehead Nebula Photodissociation Region]]**,\\ | **[[https://doi.org/10.1088/2041-8205/768/2/L25|High-accuracy Quartic Force Field Calculations for the Spectroscopic Constants and Vibrational Frequencies of 1 <sup>1</sup>//A'// //l//-C<sub>3</sub>H<sup>–</sup>: A Possible Link to Lines Observed in the Horsehead Nebula Photodissociation Region]]**,\\ |
| //Astrophys. J.// **772**, Art. No. 39 (2013).\\ | //Astrophys. J.// **772**, Art. No. 39 (2013).\\ |
| In an earlier publication, some of the authors found a discrepancy between their calculated equilibrium quartic distortion parameter and the ground state quartic distortion parameter derived from astronomical observations. As a results, they proposed to reject //l//-C<sub>3</sub>H<sup>+</sup> as carrier of the emission features mentioned above. Instead, they now propose the anion in its excited singlet state as the carrier of the emission lines. | In an earlier publication, some of the authors found a discrepancy between their calculated equilibrium quartic distortion parameter and the ground state quartic distortion parameter derived from astronomical observations. As a results, they proposed to reject //l//-C<sub>3</sub>H<sup>+</sup> as carrier of the emission features mentioned above. Instead, they now propose the anion in its excited singlet state as the carrier of the emission lines. |
| B. A. McGuire, P. B. Carroll, R. A. Loomis, G. A. Blake, J. M. Hollis, F. J. Lovas, P. R. Jewell, A. J. Remijan\\ | B. A. McGuire, P. B. Carroll, R. A. Loomis, G. A. Blake, J. M. Hollis, F. J. Lovas, P. R. Jewell, A. J. Remijan\\ |
| reported on\\ | reported on\\ |
| **[[http://dx.doi.org/10.1088/0004-637X/774/1/56|A Search for //l//-C<sub>3</sub>H<sup>+</sup> and //l//-C<sub>3</sub>H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1]]**,\\ | **[[https://doi.org/10.1088/0004-637X/774/1/56|A Search for //l//-C<sub>3</sub>H<sup>+</sup> and //l//-C<sub>3</sub>H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1]]**,\\ |
| //Astrophys. J.// **774**, Art. No. 56 (2013).\\ | //Astrophys. J.// **774**, Art. No. 56 (2013).\\ |
| The //J"// = 0 and 1 transitions of //l//-C<sub>3</sub>H<sup>+</sup> (or an alterantive carrier) were abserved in absorption in their line survey of Sgr B2(N) carried aout with the GBT 100 m telescope. A suitable, albeit blended emission at the //J"// = 6 transition was found in archival survey data. Archival survey data toward Sgr B2(OH) and TMC-1 were not unambiguous, but would yield //l//-C<sub>3</sub>H column density ratios similar to those found for the Horsehead PDR and for Sgr B2(N). These findings make it more interesting and important to establish or reject by laboratory spectroscopy that the carrier of these lines is //l//-C<sub>3</sub>H<sup>+</sup> or to present an alternative carrier. | The //J"// = 0 and 1 transitions of //l//-C<sub>3</sub>H<sup>+</sup> (or an alterantive carrier) were abserved in absorption in their line survey of Sgr B2(N) carried aout with the GBT 100 m telescope. A suitable, albeit blended emission at the //J"// = 6 transition was found in archival survey data. Archival survey data toward Sgr B2(OH) and TMC-1 were not unambiguous, but would yield //l//-C<sub>3</sub>H column density ratios similar to those found for the Horsehead PDR and for Sgr B2(N). These findings make it more interesting and important to establish or reject by laboratory spectroscopy that the carrier of these lines is //l//-C<sub>3</sub>H<sup>+</sup> or to present an alternative carrier. |
| S. Brünken, L. Kluge, A. Stoffels, O. Asvany, and S. Schlemmer\\ | S. Brünken, L. Kluge, A. Stoffels, O. Asvany, and S. Schlemmer\\ |
| reported on the\\ | reported on the\\ |
| **[[http://dx.doi.org/10.1088/2041-8205/783/1/L4|Laboratory Rotational Spectrum of //l//-C<sub>3</sub>H<sup>+</sup> and Confirmation of its Astronomical Detection]]**,\\ | **[[https://doi.org/10.1088/2041-8205/783/1/L4|Laboratory Rotational Spectrum of //l//-C<sub>3</sub>H<sup>+</sup> and Confirmation of its Astronomical Detection]]**,\\ |
| //Astrophys. J.// **783**, Art. No. L4 (2014).\\ | //Astrophys. J.// **783**, Art. No. L4 (2014).\\ |
| A novel, charge-selective form of action spectroscopy was employed to measure accurately the //J"// = 1 to 4 transition frequencies. | A novel, charge-selective form of action spectroscopy was employed to measure accurately the //J"// = 1 to 4 transition frequencies. |
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| Contributor(s): H. S. P. Müller; 11, 2012; 05, 2013; 07, 2013; 02, 2014 | Contributor(s): H. S. P. Müller; 11, 2012; 05, 2013; 07, 2013; 02, 2014 |
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