^15^NH_2_ amidogen radical rotational spectrum

In particular the ^14^N/^15^N abundance ratio of nitrogen-bearing species provides information on possible fractionation mechanisms. Up to now there is no accurate determination of this ratio in the ISM for the amidogen radical, NH_2_.

This work aimed at determining rotational frequencies of ^15^NH_2_ in order to enable its astronomical detection, which will help to understand the formation mechanisms of nitrogen hydrides in the ISM. Complementary synchrotron-based broadband far-infrared and high resolution submillimeter-wave frequency measurements have been performed to investigate the pure rotational spectrum of the ^15^NH_2_ species. The first spectroscopic study of the ^15^N-isotopologue of the amidogen radical yielded an accurate set of molecular parameters.