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Context. The determination of isotopic ratios in interstellar molecules is a powerful probe of chemical routes leading to their formation. 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 interstellar medium (ISM) for the amidogen radical, NH 2 . Aims. This work is aimed at determining rotational frequencies of 15 NH 2 to enable its astronomicaldoi:10.1051/0004-6361/201628201 fatcat:gw5egd7hwnhgjlrz6msqq6joey