Unveiling the chemistry of interstellar CH: Spectroscopy of the 2 THz $N=2\leftarrow 1$ ground state line

Helmut Wiesemeyer, Rolf Güsten, Karl M. Menten +6

The methylidyne radical CH is commonly used as a proxy for H${}_2$ in the cold, neutral phase of the interstellar medium. The optical spectroscopy of CH is limited by interstellar ex…