Carbon monophosphide

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Carbon monophosphide is a diatomic chemical with formula CP. It is cousin of CS and the cyanide radical (CN). CP and CN are both open-shell species with doublet Π ground electronic states while the ground states of CS and CO are closed-shell. The related anion, CP-, is called cyaphide.

Detection in interstellar medium

The simple diatomic radical carbon monophosphide (CP) was detected in the circumstellar envelope of the star IRC +10216 in 1990.[1] The identification was made by matching 10 rotational lines observed with the IRAM 30m radiotelescope.[2][3]


  1. ^ "Free CP in IRC + 10216". Astronomy and Astrophysics. 230: L9. 1990. Bibcode:1990A&A...230L...9G.
  2. ^ "CAS 12326-85-1 : CARBON MONOPHOSPHIDE". Retrieved 12 July 2018.
  3. ^ "ASTROMOLECULE OF THE MONTH". Retrieved 12 July 2018.
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