Microwave spectrum and molecular parameters for 14N2 16O

Extended THz measurements of nitrous oxide, N2O

“…In addition to the data collected in the present work, other recent submm/THz measurements [3,4] have been incorporated into the present analysis. The JPL spectral line catalog [5], which previously included only the data available prior to 1996 [6][7][8][9][10][11][12][13], has been updated with the new information.…”

Pure Rotation Spectrum of NNO in the Far Infrared Region

“…In the course of our meaurements of NO [4], we have accidentally found the spectrum of NNO in the region from 20 to 50 cm ~~1 as an impurity. By analyzing these data together with the available millimeter (mmw) and submillimeter (sub-mmw) wave data [5,6] up to 552 GHz, we have confirmed the ground state constants of [3].…”

“…In the course of our meaurements of NO [4], we have accidentally found the spectrum of NNO in the region from 20 to 50 cm ~~1 as an impurity. By analyzing these data together with the available millimeter (mmw) and submillimeter (sub-mmw) wave data [5,6] up to 552 GHz, we have confirmed the ground state constants of [3].The measurement has been carried out with a Bruker IFS 120 HR vacuum Michelson spectrometer at the molecular spectroscopy laboratory, Physikalisch-Chemisches Institut, Universität Giessen. The sample of NO was sublimated at a low temperature, in order to prevent contamination by water, and was transfered at a total pressure of about 150 Pa into the 1.8 m long cell sealed with polyethylene windows.…”

“…The non-linear part in (1) represents the diffraction effect at the aperture of the radiation source which gives a significant effect at long wavelengths [9], The measured transition wavenumbers of the NNO lines are summarized in Table 1 together with the mmw and sub-mmw data from [5] and [6] which were included in the present analysis. The constants obtained from the weighted least-squares fit are listed in Table 2.…”

Terahertz Measurements of Rotational Transitions in Vibrationally Excited States of N2O

“…Their analysis included a determination of the Fermi resonance constant but the accuracy of that determination was rather low compared to what is now possible. Pearson et al (9) had earlier reported a great many measurements of rotational transitions in the lowest vibrational levels of N 2 O.…”