MICROWAVE-SPECTRA OF MOLECULES OF ASTROPHYSICAL INTEREST .23. ACETALDEHYDE

The microwave spectrum of acetaldehyde is critically reviewed and supp lemented with spectral frequency calculations derived from the rotatio n-internal rotation analysis. A simultaneous analysis of the torsional ground state, upsilon(t) = 0, and first and second torsionally excite d states, upsilon(t) = 1 and 2, was carried out. The primary objective of this review is to provide radio astronomers with complete spectral coverage over the range of 900 MHz to 500 GHz for the ground state an d covering rotational quantum number, J, from 0 to 26. (C) 1996 Americ an Institute of Physics and American Chemical Society.