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"NASA Technical Reports Server (NTRS) 19920003654: Laboratory Simulation Of The Surface Of Halley's Comet" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19920003654: Laboratory Simulation Of The Surface Of Halley's Comet” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19920003654: Laboratory Simulation Of The Surface Of Halley's Comet
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19920003654

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"NASA Technical Reports Server (NTRS) 19920003654: Laboratory Simulation Of The Surface Of Halley's Comet" Description:

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In the past year we have developed a model for the dissociation of icy grains in comets. In general, this model does not predict the radical yield that is observed in the jets of comets. To reproduce these yields, the concentration of the radical's precursors will have to be too high to be consistent with the abundance that we expect in comets. We have also constructed a theoretical model for the formation of ions on icy cometary grains. That model shows that only a small number of the cometary ions could be produced as ions in icy grains if the particle has only positively charged ions. If it contains both positive and negative ions then it could have a higher concentration of ions without violating charge neutrality. When such a particle evaporates, it can release ions with both charges into the gas phase. These ions could produce radicals via dissociative recombination with electrons if they are positive ions or by photoattachment of electrons if they are negative electrons. Finally, an avalanche process involving the acceleration of electrons towards charged particles is evaluated. It is shown that this will not lead directly to gas phase ions, but it might lead to additional ionization and dissociation on the grain.

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