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- W3209003570 abstract "• High-resolution cavity ring-down spectroscopy has been used. • l -doublets of 15 N β isotopomer of N 2 O has been studied. • Spectral doublets of (12 2 0)←(02 2 0) transition were captured. • Doubling constants, Coriolis constants and rotational constants were determined. • Air broadening coefficients of e and f sub-states of 15 N β were measured. We report the direct experimental evidences of l -doublet fine splittings between the parity doublet e and f sub-states of β-site isotopomer of nitrous oxide ( 15 N 14 N 16 O) in the (12 2 0)←(02 2 0) ro-vibrational transition for l = 2 (i.e. Δ state) vibrational state in the mid-IR 7.8 µm spectral region. Due to extremely small splittings it remains a challenge for recording the fine structure doubling features for l = 2 or higher states. The existence of l- type doubling was investigated by high-resolution and ultra-sensitive cavity ring-down spectroscopy coupled with an external-cavity quantum cascade laser. We determined several new spectroscopic parameters such as l -type doubling constants, Coriolis constants, band centres, rotational constants and centrifugal distortion constants for l = 2 state of β-site N 2 O isotopomer by probing the rotationally resolved spectral lines with higher J values in the P-branch. Subsequently, the pressure broadening effect on the l -doublets and the corresponding broadening coefficients for both e and f sub-states in Δ state of β-site N 2 O were explored. Our high-resolution spectroscopic measurements will be useful for better fundamental understanding of linear polyatomic molecules and their isotopomers." @default.
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- W3209003570 date "2021-10-01" @default.
- W3209003570 modified "2023-09-26" @default.
- W3209003570 title "l-doublet splittings in Δ vibrational state of 15N14N16O isotopomer" @default.
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- W3209003570 doi "https://doi.org/10.1016/j.chphi.2021.100049" @default.
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