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Martin-Pintado, J.M. Krieg, J. R. Goicoechea, J. Stutzki, J. Zmuidzinas, K. M. Menten, L.H. Nordh, L. Pagani, M.C. Diez-Gonzalez, M. Emprechtinger, M. Gerin, M.-L. Dubernet, M. Olberg, M. P\\'erault, M. Salez, N. Honingh, N. R. Crockett, N. Trappe, P. Encrenaz, P. F. Goldsmith, P.G. Martin, P. Hartogh, P. Morris, P. Schilke, R. Bachille, R. G\\\"usten, R. Plume, R. Rolffs, R. Schieder, S. Cabrit, S.D. Lord, S.-L. Qin, S. Maret, S. Schlemmer, S. Wang, S. Yu, T. A. Bell, T. F. Giesen, T.G. Phillips, T. M\\\"oller, V. Ossenkopf, W. Baechtold, W. D. Langer","submitted_at":"2010-07-12T11:09:27Z","abstract_excerpt":"We have observed CH absorption lines ($J=3/2, N=1 \\leftarrow J=1/2, N=1$) against the continuum source Sgr~B2(M) using the \\textit{Herschel}/HIFI instrument. With the high spectral resolution and wide velocity coverage provided by HIFI, 31 CH absorption features with different radial velocities and line widths are detected and identified. 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