The multiple maxima in "A,B,C"-type i,r. spectra of hydrogen-bonded systems are caused by Fermi resonance of vOR (broad band) with 28,, and 2yo, such that the minima correspond to the overtone frequencies.
Fermi resonance between a broad v (OD) fundamental and a sharp 28(ODO) overtone is postulated to be the cause of the verydifferent appearance of the v(0H) and v(OD) i.r. absorption bands of HCrO, and DCrO,.
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