Infrared absorption spectrum of undeuterated hydrazine in the gaseous state has been observed with a resolving power better than 0.06 cm-1in the 1024 ∼ 961 cm-1region, where theRR- andRQ-branch lines of the antisymmetric wagging band (va= 1 ← 0) appear. It has been found that every line belonging to theRR branch as well as everyRQ peak of the band splits into four components, a, b, c, and d. This is explained by considering that the va= 0 state splits into AI, E, and B2substates and the va= 1 state into B1, E, and A2substates, because of the four equivalent potential minima (D4) of the hydrazine molecule which are reached by inversions of the two amino groups. From the observed wave numbers of theRR lines, effective values of the rotational constants of the B1, E, and A2sublevels of the va= 1 state were obtained. On the basis of these values and the ones for the A1, E, and B2sublevels of the ground vibrational state, obtained from a previous microwave study, a discussion of the antisymmetric wagging-inversion coordinate is given. © 1974.
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