Results 1 - 1 of 1
Results 1 - 1 of 1. Search took: 0.015 seconds
[en] Highlights: • Design of a 60–90 GHz chirped-pulse millimeter-wave spectrometer is described. • Sources of spurious frequencies in a broadband spectrometer are discussed. • The 101–000 rotational transitions of H15NO, HN18O, and D15NO are detected. • HNO pseudo-equilibrium geometry deduced from global analysis of isotopologues. An E-Band (60–90 GHz) chirped-pulse Fourier transform millimeter-wave spectrometer has been constructed for eventual kinetics and dynamics studies. The performance of the spectrometer is demonstrated with the molecule nitroxyl (HNO). Using the new spectrometer and by passing isotopically labelled methyl nitrite (CH3ONO) through a pyrolysis nozzle, the spectra of minor isotopologues of HNO have been obtained. The observations on the isotopologues identified here, H15NO, HN18O, and D15NO, have been combined with the earlier isotopic observations, HNO and DNO, to create a global HNO geometry that approximates an equilibrium structure. The results are compared to high-level ab initio calculations.