FTIR Spectrum and Perturbation Analysis of the ν_2 Band of 15NO_3
Abstract
In 1987, Friedl and Sander reported observation of the FTIR spectrum of the ν_2 band of 14NO_3 in 762 cm-1 region, and rotational analysis was carried out for only transitions with K=3. The obtained negative centrifugal distortion constant D_N implied presence of perturbation from other states, but the perturbation analysis has not been carried out. In the present study, the ν_2 band of 15NO_3 was first observed in 742 cm-1 region. In contrast to the case of 14NO_3 , rotational assignments were carried out for K=0, 3, 6, 9, 12, and 15, and transitions with N≤12 were fitted with usual energy level expression for D3h molecule. However, when we included higher N transitions up to N=22, an effect of Coriolis interaction from v_4=2 appeared in negative D_N for K=0 and staggering in K=3. An energy matrix including ℓ=0 and ℓ=±2 of v_4=2 and ℓ=0 of v_2 =1 was used to obtain the energy values of v_2 =1 , including the Corilis and ℓ-type resonance terms. From the determined interaction constant between v_2 =1 and v_4=2 , anharmonic constant k444 was estimated, by assuming a mixing of v_4=1 and v_4=2.
R. R. Friedel and S. P. Sander, J. Phys. Chem. 91, 2721 (1987).- Publication:
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67th International Symposium on Molecular Spectroscopy
- Pub Date:
- June 2012
- Bibcode:
- 2012mss..confETI05S
- Keywords:
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- RADICALS AND IONS