Determine accurate vibration-rotation constants and evaluate molecular perturbations in nitrous oxide across the 2395 to 3510 cm⁻¹ infrared region.
Measured the infrared absorption spectrum of nitrous oxide from 2395 to 3510 cm⁻¹ using a high-resolution grating spectrometer.
Used long optical absorption paths within a heated cell to detect weak transitions originating from excited vibrational levels (ν2, 2ν2⁰, 2ν2², and ν1).
Derived accurate rotational constants, including values for l-type doubling and vibrational-level variations of the centrifugal stretching constant.
Correlated newly measured constants with existing data to improve fundamental molecular parameters, with focused evaluation of Fermi resonance and other weak interactions.
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Implication
Spectroscopic analysis reveals refined vibration-rotation constants in nitrous oxide, highlighting precise molecular parameters and Fermi interactions.