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<i>Herschel</i>/HIFI observations of interstellar OH<sup>+</sup>and H<sub>2</sub>O<sup>+</sup>towards W49N: a probe of diffuse clouds with a small molecular fraction
We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N. We have used Herschel's HIFI instrument, in dual beam switch mode, to observe the 972 GHz N = 1 - 0 transition of OH+ and the 1115 GHz …