Microwave Spectra of Molecules of Astrophysical Interest. XXVI. Acetic Acid (CH3COOH)

The microwave spectrum of acetic acid is critically reviewed and supplemented with spectral frequency calculations derived from the rotation-torsion analysis. A simultaneous analysis of the torsional ground state, vt=0, and first and second torsionally excited states, vt=1 and 2, was carried out using the so-called“rho axis method.” The primary objective of this review is to provide radio astronomers with complete spectral coverage over the 1–400 GHz range for the ground and vt=1 states, covering rotational quantum numbers J⩽30 and |Ka|⩽15.