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New measurements of HOC ϩ emission have been carried out toward several photon-dominated regions using the National Radio Astronomy Observatory 12 m telescope. Toward the Orion bar, the , , and J ϭ 1 r 0 2 r 1 transitions of HOC ϩ at 89, 179, and 268 GHz were detected, as well as the line in M17-SW. 3 r 2 J ϭ 1 r 0 In conjunction with observations of HC 18 O ϩ , [HCO ϩ ]/[HOC ϩ ] abundance ratios have been established in these objects. Toward M17-SW, a ratio of ∼2260 was found. In the Oriondoi:10.1086/312096 fatcat:ewub2rsfk5fs7f55ybd2uwhcki