Abstract
The infrared spectra of acetic acid and acetic acid‐d, as vapors at 150°C, have been obtained from 2–25μ and an assignment of the fundamental vibrational frequencies made for the monomeric acids, with the exception of the two low lying type A″ torsional frequencies. Infrared spectra of the two acids, in the vapor phase, have also been obtained over the 5–15μ region at 25°, 65°, 105°, and 150° and the effect of temperature on some of the frequencies discussed.

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