Abstract
A slit nozzle supersonic expansion containing C2H2 (246sccm) and N2O (355sccm) seeded into Ar (1260sccm) is investigated using CW cavity ring-down spectroscopy, in the 1.5μm range. The C2H2−N2O van der Waals complex is observed around the 2CH acetylenic band. Despite strong perturbations, 117 b-type lines are assigned. Their combined fit with published microwave data leads to new upper state and improved lower state rotational constants. The Lorentzian width of the assigned line profiles sets the mean lifetime to 1.6ns. The rotational temperature is estimated to be 15K from the comparison between observed and simulated spectra.
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