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--- molecules:ism:c4h-minus [2019/02/25 22:38] – external edit 127.0.0.1
+++ molecules:ism:c4h-minus [2019/10/23 17:16] (current) – mueller
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 The butadiynylide ion has been detected toward the carbon rich star IRC +10216 in 5 rotational transitions from //J// = 9 – 8 to 15 – 14 which occur in the 3 and 2 mm regions:\\
 J. Cernicharo, M. Guélin, M. Agúndez, K. Kawaguchi, M. C. McCarthy, and P. Thaddeus,\\
-**[[http://dx.doi.org/10.1051/0004-6361:20077415|Astronomical Detection of C<sub>4</sub>H<sup>–</sup>, the Second Interstellar Anion]]**\\
+**[[https://doi.org/10.1051/0004-6361:20077415|Astronomical Detection of C<sub>4</sub>H<sup>–</sup>, the Second Interstellar Anion]]**\\
 //Astron. Astrophys.// **467**, L37–L40 (2007).\\
 Several additional transitions of C<sub>6</sub>H<sup>–</sup>, detected and reported earlier, were also observed.
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 The molecule was detected tentatively toward a low-mass protostar:\\
 N. Sakai, T. Sakai, and S. Yamamoto,\\
-**[[http://dx.doi.org/10.1086/527376|Tentative Detection of C<sub>4</sub>H<sup>–</sup> toward the Low-Mass Protostar IRAS 04368+2557 in L1527]]**\\
+**[[https://doi.org/10.1086/527376|Tentative Detection of C<sub>4</sub>H<sup>–</sup> toward the Low-Mass Protostar IRAS 04368+2557 in L1527]]**\\
 //Astrophys. J.// **673**, L71–L74 (2008);\\
 this detection was confirmed in a rather extensive study of anions and related neutral species:\\
 M. Agúndez, J. Cernicharo, M. Guélin, M. Gerin, M. C. McCarthy, and P. Thaddeus,\\
-**[[http://dx.doi.org/10.1051/0004-6361:20078985|Search for Anions in Molecular Sources: C<sub>4</sub>H<sup>–</sup> Detection in L1527]]**\\
+**[[https://doi.org/10.1051/0004-6361:20078985|Search for Anions in Molecular Sources: C<sub>4</sub>H<sup>–</sup> Detection in L1527]]**\\
 //Astron. Astrophys.// **478**, L19–L22 (2008).
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 Contributor(s): H. S. P. Müller; 5, 2007; 1, 2008
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