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The microwave spectrum of benzoic acid was observed in the frequency range 30∼40GHz by using a Stark modulation spectrometer and 6–10GHz by a molecular beam Fourier-transform microwave spectrometer (MB-FTMW). The rotational and centrifugal distortion constants of the normal and carboxylic deuterated species were obtained for the ground and C1–COOH torsional state. For the normal species in the ground...