The torsional oscillation between the two OH groups of the hydrogen peroxide molecule is investigated through a study of the far-infrared absorption spectrum of the molecule. A 1-m-focal-length vacuum grating monochromator was used to scan the region from 15 to 700 cm-I with an average resolution of 0.3 em-I. The observed spectrum contains seven perpendicular-type bands of which only the Q branches are resolved.
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