Mid-infrared spectra of difluoroacetic acid (DFAA) have been measured by isolating the molecule in argon and nitrogen matrices at 8 K and also in the vapor phase at room temperature. In argon matrix, the O-H stretching fundamental (ν) of -COOH group appears as a doublet with band maxima at 3554 and 3558 cm, and a similar doublet for C═O stretching fundamental appears at 1800 and 1810 cm. In the vapor phase, the ν transition is featured with multiple peaks, and the observed band shape has been deconvoluted as superposition of two transitions both having A-type rotational band contours.
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