Discovery of Interstellar Hydrogen Fluoride

@article{Neufeld1997DiscoveryOI,
  title={Discovery of Interstellar Hydrogen Fluoride},
  author={David A. Neufeld and Jonas Zmuidzinas and Peter Schilke and Thomas G. Phillips},
  journal={The Astrophysical Journal Letters},
  year={1997},
  volume={488},
  pages={L141 - L144}
}
We report the first detection of interstellar hydrogen fluoride. Using the Long Wavelength Spectrometer of the Infrared Space Observatory (ISO), we have detected the 121.6973 μm J=2-1 line of HF in absorption toward the far-infrared continuum source Sagittarius B2. The detection is statistically significant at the 13 σ level. On the basis of our model for the excitation of HF in Sgr B2, the observed line equivalent width of 1.0 nm implies a hydrogen fluoride abundance of ~3 × 10-10 relative to… 

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