<i>HERSCHEL</i>OBSERVATIONS OF INTERSTELLAR CHLORONIUM. II. DETECTIONS TOWARD G29.96-0.02, W49N, W51, AND W3(OH), AND DETERMINATIONS OF THE ORTHO-TO-PARA AND<sup>35</sup>Cl/<sup>37</sup>Cl ISOTOPIC RATIOS
<i>HERSCHEL</i>OBSERVATIONS OF INTERSTELLAR CHLORONIUM. II. DETECTIONS TOWARD G29.96-0.02, W49N, W51, AND W3(OH), AND DETERMINATIONS OF THE ORTHO-TO-PARA AND<sup>35</sup>Cl/<sup>37</sup>Cl ISOTOPIC RATIOS
We report additional detections of the chloronium molecular ion, H2Cl+, toward four bright submillimeter continuum sources: G29.96-0.02, W49N, W51, and W3(OH). With the use of the HIFI instrument on board the Herschel Space Observatory, we observed the transition of ortho-HCl+ at 781.627 GHz in absorption toward all four sources. Much …