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 Hydrogen Fluoride, HF, in Space ===== The //J// = 2 – 1 transition HF was detected in absorption toward Sgr B2 with the Long Wavelength Spectrometer of the ISO satellite:\\ D. A. Neufeld, J. Zmuidzinas, P. Schilke, and T. G. Phillips,\\ **[[https://doi.org/10.1086/310942|Discovery of Interstellar Hydrogen Fluoride]]**\\ //Astrophys. J.// **488**, L141–L144 (1997). The //J// = 1 – 0 transition was observed with the HIFI instrument of the //Herschel// satellite toward G10.6-0.4 (W31C) and Orion KL. Absorption dominates in the former case, but also, very surprisingly, in the latter:\\ D. A. Neufeld, P. Sonnentrucker, T. G. Phillips, et al.,\\ **[[https://doi.org/10.1051/0004-6361/201014523|Strong Absorption by Interstellar Hydrogen Fluoride: //Herschel///HIFI Observations of the Sight-Line to G10.6–0.4 (W31C)]]**\\ //Astron. Astrophys.// **518**, Art. No. L108 (2010);\\ T. G. Phillips, E. A. Bergin, D. C. Lis, et. al.,\\ **[[https://doi.org/10.1051/0004-6361/201014570|//Herschel// Observations of EXtra-Ordinary Sources (HEXOS): Detection of Hydrogen Fluoride in Absorption towards Orion KL]]**\\ //Astron. Astrophys.// **518**, Art. No. L109 (2010). The same transition was also detected in the circumstellar envelope of the carbon rich star CW Leo by:\\ M. Agúndez, J. Cernicharo, L. B. F. M. Waters, L. Decin, P. Encrenaz, D. Neufeld, D. Teyssier, and F. Daniel,\\ **[[https://doi.org/10.1051/0004-6361/201117578|HIFI detection of Hydrogen Fluoride in the Carbon Star Envelope IRC +10216]]**\\ //Astron. Astrophys.// **533**, Art. No. L6 (2011). More recently this transition has even been detected in emission in the photon-dominated region by:\\ F. F. S. van der Tak, V. Ossenkopf, Z. Nagy, A. Faure, M. Röllig, and E. A. Bergin,\\ **[[https://doi.org/10.1051/0004-6361/201118308|Detection of HF Emission from the Orion Bar]]**\\ //Astron. Astrophys.// **537**, Art. No. L10 (2012). The //R//(0) rovibrational transition of HF at 4000.989 cm<sup>–1</sup> or 2.499385 μm was detected with CRIRES at the Very Large Telescope in absorption toward V1074 Sco, aka HD 154368, and Elias 29 by:\\ N. Indriolo, D. A. Neufeld, A. Seifahrt, and M. J. Richter,\\ **[[https://doi.org/10.1088/0004-637X/764/2/188|Direct Determination of the HF/H<sub>2</sub> Abundance Ratio in Interstellar Gas]]**\\ //Astrophys. J.// **764**, Art. No. 188 (2013).\\ //R//(0) as well as //R//(1) were also detected toward AFGL 2136 IRS 1. ---- Contributor(s): H. S. P. Müller; 03, 2007; 12, 2010; 08, 2011; 07, 2012; 11, 2013 ---- molecules/ism/hf.txt Last modified: 2019/10/18 12:59by mueller