Carbon Monophosphide
The simple diatomic radical carbon monosulphide (CP) was detected in the circumstellar envelope of IRC+10216 by Guélin et al. and reported in 1990. The identification was made by matching 10 rotational lines observed with the IRAM 30m radiotelescope.
CP and CN are the pnictogenic cousins of the chalcogenic species CS and CO, respectively. Aside from differences in the masses of the heavy atoms in each diatomic, 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 chemical name of the compound is carbon monophosphide. It's chemical formula is CP and molecular weight is 42.984
References [1]