NASA NTRS · 19730025512
An upper limit on the OH abundance in the intercloud medium.
Abstract
A search for weak OH emission at 1665 and 1667 MHz was carried out in three high-latitude directions containing no compact clouds of H I or dust. No OH emission was detected down to low limits, and the comparison of our upper limits with the known H I and dust-column densities reinforces the suggestion that OH tends to be concentrated to regions of high dust or gas density.
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Knapp, G. R., Kerr, F. J.. 1972-10-01. An upper limit on the OH abundance in the intercloud medium.. https://ntrs.nasa.gov/citations/19730025512
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