Abstract
Abstract The microwave spectra of o-difluorobenzene in various excited vibrational states have been measured in the frequency region from 10- to 30-GHz. The R- and Q-branch transitions of the a-type have been assigned. The rotational constants for the ν1=1 state are A=3254.77, B=2226.85, and C=1324.67 MHz, and those for the ν2=1 state are A=3269.76, B=2220.48, and C=1322.94 MHz. The inertial defects in the excited states have been used in order to make vibrational assignments. It is very probable that the ν1 and the ν2 mode are the out-of-plane vibration of A2 and the in-plane vibration of A1 respectively.
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