Ices on the Surface of Triton

@article{Cruikshank1993IcesOT,
  title={Ices on the Surface of Triton},
  author={Dale P. Cruikshank and Ted L. Roush and Tobias C. Owen and T. R. Geballe and Catherine de Bergh and Bernard Schmitt and R. H. Brown and Mary Jane Bartholomew},
  journal={Science},
  year={1993},
  volume={261},
  pages={742 - 745}
}
The near-infrared spectrum of Triton reveals ices of nitrogen, methane, carbon monoxide, and carbon dioxide, of which nitrogen is the dominant component. Carbon dioxide ice may be spatially segregated from the other more volatile ices, covering about 10 percent of Triton's surface. The absence of ices of other hydrocarbons and nitriles challenges existing models of methane and nitrogen photochemistry on Triton. 
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Production of CO and CO2 after ion irradiation of ices
Ion irradiation of ice mixtures produces several effects among which structural changes of the ice and the formation of other species both more volatile and refractory not present in the original
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