Microwave Spectrum of Hydroxylamine

The microwave spectra of hydroxylamine and its deuterated species: NH 2 OH, NH 2 OD, NHDH, ND 2 OH, NHDOD and ND 2 OD have been observed and analyzed. Their rotational constants have been determined. The molecular structure of hydroxylamine is determined to be r (N–H)=1.016±0.008Å, r (N–O)=1.453±0.002Å, r (O–H)=1.962±0.005Å, \(θ(){=}107∘06'{±}30'\), \(θ(){=}103∘15'{±}30'\) and \(θ(){=}101∘22'{±}30'\). The dipole moment and quadrupole coupling constants of NH 2 OH are also determined. No splitting due to the inversion of the NH 2 -group is resolved.