Infrared spectrum and rotational isomerism of acrylic acid

Abstract The infrared spectrum of monomeric acrylic acid has been observed between 200 and 4000 cm −1 for a dilute sample in an inert matrix at 25 K. Absorption bands due to the cis and trans rotamers have been distinguished using UV irradiation experiments and identified on the basis of theoretical calculations. Assignments have been made of the observed absorptions to normal modes of vibration for both rotamers.