Ortho-to-para ratio of NH<sub>2</sub>
Ortho-to-para ratio of NH<sub>2</sub>
We have used the Herschel-HIFI instrument to observe the two nuclear spin symmetries of amidogen (NH2) towards the high-mass star-forming regions W31C (G10.6−0.4), W49N (G43.2−0.1), W51 (G49.5−0.4), and G34.3+0.1. The aim is to investigate the ratio of nuclear spin types, the ortho-to-para ratio (OPR) of NH2 in the translucent interstellar …