Abstract
The spectroscopic features of l-type doublets of the site-specific 15N-isotopomers of nitrous oxide (N2O) are interesting to study as it would reveal the effect of l-type doubling in different branches of the transition band and on the spectroscopic parameters. Here, we have explored various spectroscopic features that are influenced by the l-type doubling of the fine structure lines of the β-site isotopomer of N2O, i.e. 15N14N16O (or 15Nβ) in the (1110)←(0110) transition for l = 1 (i.e. Π state) vibrational state in the mid-IR region. High-resolution spectroscopic measurements of rotationally-resolved l-type splitting involving the parity doublet e and f sub-states of 15N-β isotopomer corresponding to the P-and R-branches of the (1110)←(0110) vibrational band near 7.8 μm were carried out by cavity ring-down spectroscopy (CRDS) coupled with a continuous-wave external-cavity quantum cascade laser (cw-EC-QCL). Several new spectroscopic parameters such as l-type doubling constants, Coriolis constants, band centres, rotational constants and centrifugal distortion constants were determined for both the parity doublet e and f components of 15Nβ isotopomer. We also investigated the effects of temperature and pressure on the l-type doublets along with the dependency of pressure broadening coefficients on the rotational quantum number J. The new experimental data will improve our understanding of the molecular properties of the site-specific 15N-isotopomers of N2O and intramolecular distribution of 15N-isotopes within the N2O isotopomers.
Published Version
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