Submillimeter wave spectrum and molecular constants of N2O

Abstract The submillimeter wave spectrum of the N 2 O molecule has been investigated within the 375–565 GHz frequency range with a sensitivity better than 10 −8 cm −1 . The measured frequencies include 161 lines with intensities γ ≳ 10 −6 cm −1 belonging to 22 spectroscopically different species of the molecule (specifically, the ground and some excited vibrational states of the five most abundant isotopic species of the molecule in natural abundance) with a statisticall and systematic error of the order of magnitude 10 −8 . Rotational and two centrifugal stretching constants could be determined for each spectroscopic species. For each isotopic species observed, we have made a general analysis of the spectrum in different vibrational states bearing in mind resonance effects. The total number of the rotational and rovibrational constants obtained exceeds 40.