Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ===== On the Detection of Amidogen, NH2, in the Interstellar Medium ===== The //N<sub>KaKc</sub>// = 1<sub>10</sub> – 1<sub>01</sub> //para// rotational transition of amidogen, NH<sub>2</sub>, was observed in absorption toward Sgr B2 (N) and (M):\\ E. F. van Dishoek, D. J. Jansen, P. Schilke, and T. G. Philips,\\ **[[https://doi.org/10.1086/187076|Discovery of the Interstellar NH<sub>2</sub> Radical]]**\\ //Astrophys. J.// **416**, L83–L86 (1993).\\ Three fine structure components were observed with partially resolved <sup>14</sup>N hyperfine structure which obviously secures the identification.\\ \\ Further transitions were reported in\\ J. R. Goicoechea, N. J. Rodríguez-Fernández and J. Cernicharo,\\ **[[https://doi.org/10.1086/379704|The Far-Infrared Spectrum of the Sagittarius B2 Region: Extended Molecular Absorption, Photodissociation, and Photoionization]]**\\ //Astrophys. J.// **600**, 214–233 (2004).\\ \\ M. Melosso, L. Bizzocchi, O. Sipilä, B. M. Giuliano, L. Dore, F. Tamassia, M.-A. Martin-Drumel, O. Pirali, E. Redaelli, and P. Caselli\\ reported on the\\ **[[https://doi.org/10.1051/0004-6361/202038490|First detection of NHD and ND2 in the interstellar medium — Amidogen deuteration in IRAS 16293–2422]]**\\ //Astron. Astrophys.// **641**, Art. No. A153 (2020).\\ Both isotopologs were detected in archival HIFI///Herschel// data taken toward the Class 0 protostar IRAS 16293−2422. Very high degrees of deuteration were inferred.\\ \\ A similar account was given shortly thereafter by\\ A. Bacmann, A. Faure, P. Hily-Blant, K. Kobayashi, H. Ozeki, S. Yamamoto, L. Pagani, and F. Lique,\\ **[[https://doi.org/10.1093/mnras/staa2903|Deuterium fractionation of nitrogen hydrides: detections of NHD and ND2]]**\\ //Mon. Not. R. Astron. Soc.// **499**, 1795 (2020).\\ NHD observations are based on archival APEX data, ND<sub>2</sub> observations on archival HIFI///Herschel// data as above. The numbers are very similar to the ones above. One can deduce deuteration degrees per A atom of ~0.25 and ~0.35 for NHD and ND<sub>2</sub>, respectively, from their total column densities.\\ \\ ---- Contributor(s): H. S. P. Müller; 03, 2007; 02, 2023 ---- molecules/ism/nh2.txt Last modified: 2023/02/10 16:31by mueller