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 Imidogen, NH, in the Interstellar Medium ===== One and two transitions of the //A// <sup>3</sup>Π – //X// <sup>3</sup>Σ electronic spectrum of imidogen near 335 nm were detected in diffuse clouds toward ζ Per and HD 27778, respectively:\\ D. M. Meyer and K. C. Roth,\\ **[[https://ui.adsabs.harvard.edu/abs/1991ApJ...376L..49M|Discovery of Interstellar NH]]**\\ //Astrophys. J.// **376**, L49–L52 (1991).\\ The transitions involve an //R//(0) component in both cases as well as a //Q//(0) component of the //v// = 0 – 0 vibrational band system near 335.8 and 335.4 nm, respectively. The detection of one fine struture component of the //N// = 2 – 1 pure rotational transition toward Sgr B2 was reported by\\ J. Cernicharo, J. R. Goicoechea, and E. Caux,\\ **[[https://doi.org/10.1086/312668|Far-Infrared Detection of C<sub>3</sub> in Sagittarius B2 and IRC +10216]]**\\ //Astrophys. J.// **534**, L199–L202 (2000);\\ a second fine structure component of that transition was 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). A plethora of reports on observations of one or more fine structure components of the //N// = 1 – 0 transition in absorption carried out with //Herschel///HIFI were reported in the HIFI special issue of A&A. In, at least, most instances, the observatioon of absorption lines indicates the presence of NH in diffuse gas. The objects investigated include\\ a photon-dominated region: A. Fuente, O. Berné, J. Cernicharo, et al.:\\ **[[https://doi.org/10.1051/0004-6361/201015093|Herschel Observations in the Ultracompact HII Region Mon R2 – Water in Dense Photon-Dominated Regions (PDRs)]]**\\ //Astron. Astrophys.// **521**, Art. No. L23 (2010);\\ a young stellar object: A. O. Benz, S. Bruderer, E. F. van Dishoeck, et al.:\\ **[[https://doi.org/10.1051/0004-6361/201015111|Hydrides in Young Stellar Objects: Radiation Tracers in a Protostar-Disk-Outflow System]]**\\ //Astron. Astrophys.// **521**, Art. No. L35 (2010);\\ the sight line toward a high-mass star-forminbg region: C. M. Persson, J. H. Black, J. Cernicharo, et al.:\\ **[[https://doi.org/10.1051/0004-6361/201015105|Nitrogen Hydrides in Interstellar Gas – //Herschel///HIFI Observations towards G10.6-0.4 (W31C)]]**\\ //Astron. Astrophys.// **521**, Art. No. L45 (2010);\\ and another young stellar object: P. Hily-Blant, S. Maret, A. Bacmann, et al.:\\ **[[https://doi.org/10.1051/0004-6361/201015253|Nitrogen Cydrides in the Cold Envelope of IRAS 16293-2422]]**\\ //Astron. Astrophys.// **521**, Art. No. L52 (2010). In this context, also ND was observed in two fine structure components of the //N// = 1 – 0 transition by:\\ A. Bacmann, E. Caux, P. Hily-Blant, et al.\\ **[[https://doi.org/10.1051/0004-6361/201015102|First Detection of ND in the Solar-Mass Protostar IRAS 16293-2422]]**\\ //Astron. Astrophys.// **521**, Art. No. L42 (2010). ---- Contributor(s): H. S. P. Müller; 03, 2007; 04, 2011 ---- molecules/ism/nh.txt Last modified: 2019/10/18 12:52by mueller