Abstract
By comparing the high-resolution photoelectron spectra of acetaldehyde and three of its deuterated derivatives (CH3CDO, CD3CHO, and CD3CDO) in the first system (?), the assignment of six vibrational modes in the ground state of the acetaldehyde ion was possible. The vibronic structure of this system is very sensitive to deuteration of the CH3 or CHO group, showing that the active vibrations include complex motions of all the hydrogen atoms in acetaldehyde. The most prominent vibrations are the CH bending and CH3 deformation modes which reveal that the oxygen lone pair electrons play an important role in determining the bond angles in the acetaldehyde ion.
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