Detection of OH<sup>+</sup>and H<sub>2</sub>O<sup>+</sup>towards Orion KL
Detection of OH<sup>+</sup>and H<sub>2</sub>O<sup>+</sup>towards Orion KL
We report observations of the reactive molecular ions OH$^+$, H$_2$O$^+$, and H$_3$O$^+$ towards Orion KL with Herschel/HIFI. All three $N=1-0$ fine-structure transitions of OH$^+$ at 909, 971, and 1033GHz and both fine-structure components of the doublet {\it ortho}-H$_2$O$^+$ $1_{11}-0_{00}$ transition at 1115 and 1139GHz were detected; an upper limit was …