Electronic spectrum of acetaldehyde: Vibrational analysis of the 182-nm system

The electronic absorption spectra of CH ₃CHO, CH ₃CDO, CD ₃CHO, and CD ₃CDO have been obtained in the vacuum ultraviolet region. Vibrational analysis of the 182-nm system was made with the help of wavenumbers from their infrared spectra and also geometries and wavenumbers obtained from ab initio calculations. This system is assigned as a single Rydberg (3 s - n) electronic transition.