Second order Coriolis resonance in the v2, v5 Raman bands of CH3F
Escribano, R., Mills, I. and Brodersen, S. (1976) Second order Coriolis resonance in the v2, v5 Raman bands of CH3F. Journal of Molecular Spectroscopy, 61 (2). pp. 249-264. ISSN 0022-2852
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To link to this item DOI: 10.1016/0022-2852(76)90247-2
The vibration-rotation Raman spectrum of the ν2 and ν5 fundamentals of CH3F is reported, from 1320 to 1640 cm−1, with a resolution of about 0.3 cm−1. The Coriolis resonance between the two bands leads to many perturbation-allowed transitions. Where the resonance is still sufficiently weak that the quantum number K′ retains its meaning, perturbation-allowed transitions are observed for all values of ΔK from +4 to −4; in regions of strong resonance, however, we can only say that the observed transitions obey the selection rule Δ(k−l) = 0 or ±3. The spectrum has been analyzed by band contour simulation using a computer program based on exact diagonalization of the Hamiltonian within the ν2, ν5 vibrational levels, and improved vibration-rotation constants for these bands are reported. The relative magnitudes and relative sings of polarizability derivatives involved in these vibrations are also reported.