Infrared emission by organic grains in the coma of comet Halley

@article{Chyba1987InfraredEB,
  title={Infrared emission by organic grains in the coma of comet Halley},
  author={Christopher F. Chyba and Carl E. Sagan},
  journal={Nature},
  year={1987},
  volume={330},
  pages={350-353}
}
Spacecraft1 and ground-based2–5 observations of comet Halley in the near-infrared reveal a triple-peaked emission feature near 3.4 µm, characteristic of C–H stretching in hydrocarbons (–CH3 and –CH2– alkanes). Here we discuss transmission spectra of organic residues produced by laboratory irradiation of candidate cometary ices, which serve as the basis for a model of emitting cometary dust. The laboratory synthesis of solid organic residue from irradiated low-occupancy methane ice clathrate… 

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