An investigation of the supersonic dispersion in acetaldehyde vapour was carried out in piezoelectric, magnetostriction and Kundt’s tube interferometers over as wide a range of frequency and pressure as possible. Acetaldehyde is found to exhibit a multiple dispersion region which is independently confirmed by absorption measurements. This implies that certain intramolecular vibrations are activated independently.
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Alexander et al. (1942) studied this question.
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