Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Daughter Molecule, Comet

Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_392-3


A daughter molecule is a molecule produced from the photodissociation of a parent molecule which is directly outgassed from a cometary nucleus. The most abundant parent molecule is H2O; its dissociation products are H and OH. Other parent molecules include CO, CO2, CH4, NH3, HCN, H2CO, and H2S. Daughter molecules include CN, CS, and CO (which appears to be both a parent and a daughter molecule). Daughter molecules and radicals are mostly detected from their visible and ultraviolet spectra, while parent molecules are better observed with IR and millimeter spectroscopy.

See Also


Bioorganic Chemistry Parent Molecule Cometary Nucleus Ultraviolet Spectrum Dissociation Product 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.LESIA - Bâtiment ISO (n°17)Observatoire de Paris - Section de MeudonMeudonFrance