Irvine, William M.FRIBERG, PKAIFU, NMATTHEWS, HEMINH, YCOHISHI, MISHIKAWA, S2024-04-262024-04-261990https://hdl.handle.net/20.500.14394/2933<p>The published version is located at <a href="http://adsabs.harvard.edu/full/1990A&A...229L...9I">http://adsabs.harvard.edu/full/1990A&A...229L...9I</a></p>The detection of formic acid (HCOOH) in a cold dark interstellar cloud (L134N) is reported. The observed abundance of 3 x 10 to the 10th relative to H2 is between one and two orders of magnitude lower than that calculated by published ion-molecule models of dark-cloud chemistry, but is quite consistent with recent model revisions based on new reaction rates. Formic acid was not detected in the archetypical dark cloud TMC-1, and was tentatively detected in the region of massive star formation W51.Astrophysics and AstronomyArticle