Comets: production mechanisms of hydroxyl and hydrogen halos.

@article{Delsemme1971CometsPM,
  title={Comets: production mechanisms of hydroxyl and hydrogen halos.},
  author={A. H. Delsemme},
  journal={Science},
  year={1971},
  volume={172 3988},
  pages={1126-7}
}
The brightness dependence on the heliocentric distance that has been observed for the hydrogen and the hydroxyl halos of comet 1969g can be quantitatively explained by a three-step process: the vaporization of the water snows, the photodissociation of the water molecule into the ground states of hydrogen and hydroxyl, and the photoexcitation of hydrogen and hydroxyl by a fluorescence mechanism. 

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