The high-resolution Fourier transform spectrum of the D2O molecule were recorded and analyzed in the region near 0.97 μm (10 200-10 440 cm−1) where the bands of the ν = 4 (ν = ν1 + ν2/2 + ν3) polyad are located. Transitions belonging to the strongest band of the polyad, 3ν1 + ν3, are assigned up to the value of the rotational angular momentum quantum number J = 13. The presence of strong local resonance interactions allowed us to assign some transitions to the very weak band 4ν1. Upper states energies obtained on that basis were fitted with a Hamiltonian model which took into account resonance interactions between the states of the ν = 4 polyad. The derived spectroscopic parameters reproduce the overwhelming majority of assigned transitions within experimental accuracy.
Bibliographical noteFunding Information:
This work was partially supported by the National Project for the Development of Key Fundamental Sciences in China, by the National Natural Science Foundation of China, by the Foundation of the Chinese Academy of Science, and by the Ministry of Education of Russian Federation. O. Ulenikov thanks the University of Science and Technology of China for a guest professorship.
- Do molecule
- Spectroscopic parameters
- Vibration-rotation spectra