Methyl chloride (CH3), a well-known
molecule, was detected simultaneously in both the low-mass protostar
IRAS 16293-2422 and in comet
as reported in 2017 by Fayolle et al.
The interstellar detection was made with the ALMA observatory.
Both the 35Cl and 37Cl isomers were detected for 13K–12K with
K=0–4 and other rotational transitions. The cometary detection was made with the
ROSINA-DFMS instrument on
about the detection often connected it to one of the terrestrial use of
methyl chloride (or
chloromethane), as the refrigerant
Freon-40 or R-40. In addition to
industrial production and use, chloromethane is produced
naturally as well. It is