January 2021
HCl+ cation

In 2012, De Luca and coworkers reported the detection of HCl+, the radical cation formed when hydrogen chloride is ionized. The observations were performed with the HIFI instrument on the Herschel orbital observatory. HCl+ was detected toward two star-forming regions, W31C (G10.6-0.4) and W49N. The radical character gives rise to doublet features—closely spaced pairs of lines—which are helpful for detecting such species. The laboratory rotational spectrum of HCl+ was measured by Gupta et al. and published back-to-back in ApJL with the interstellar detection. No confirming observations have evidently been perfomed to date.

Related species: HCl was detected in 1985, and protonated HCl (H2Cl+) was detected in 2010.

Researcher Links
M De Luca
H Gupta
D Neufeld
M Gerin
D Teyssier
BJ Drouin
JC Pearson
DC Lis
R Monje
TG Phillips
JR Goicoechea
B Godard
E Falgarone
A Coutens
TA Bell

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