Hydroxyl (OH) is expected to be abundant in diffuse interstellar molecular gas because it forms along with H2 under similar conditions and forms within a similar extinction range.

For the remainder of the abstract, please download this article or visit: https://doi.org/10.3847/1538-4365/aaa762

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Published in The Astrophysical Journal Supplement Series, v. 235, no.1, 1, p. 1-15.

© 2018. The American Astronomical Society. All rights reserved.

The copyright holder has granted the permission for posting the article here.

This group of authors is collectively known as The PRIMO Collaboration.

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This work is supported by the National Key R&D Program of China 2017YFA0402600 and International Partnership Program of Chinese Academy of Sciences No. 114A11KYSB20160008. D.L. acknowledges support from the "CAS Interdisciplinary Innovation Team" program. J.R.D. is the recipient of an Australian Research Council DECRA Fellowship (project number DE170101086). L.B. acknowledges support from CONICYT Project PFB06.

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