Canadian Journal of Physics · 1955 · 21 citations · 8 references
Natural SciencesChemistryPhysicsMolecular PhysicsPhysical ChemistrySpectroscopyInfrared SpectroscopyMolecular SpectroscopyMolecular VibrationRaman SpectroscopyVibrational SpectroscopyVibrational StructureCoriolis InteractionGas Pressure EffectsRaman Data AnalysisRaman SpectraRaman Spectral AssignmentRaman TransitionsRotational Energy LevelsRotational Levels
The doubly degenerate ν 2 Raman band of methane was photographed at a gas pressure of 2 atm. with a reciprocal linear dispersion of 10.5 cm. −1 per mm. An analysis of the O and S branches gave ν 0 = 1533.6, B 0 = 5.270, and B 1 = 5.392 cm. −1 . When the Raman data are combined with the infrared data of Burgess, Bell, and Nielsen, the effect of the Coriolis interaction of ν 2 with ν 4 is seen to be a splitting of the rotational levels of the upper vibrational state of ν 2 into two sets, each of which can be represented by an effective value of B 1 . The Raman O, S and the infrared P (strong), Q, R (weak) transitions terminate in states with B 1 = 5.392 cm. −1 ; the Raman P, Q, R and the infrared P (weak), R (strong) transitions terminate in states with B 1 = 5.322 cm. −1 .
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