Abstract
Vinyl alcohol, CH 2CHOH, has been produced by thermolysis of ethylene glycol, HOCH 2CH 2OH, and the photoelectron spectrum measured. The region of the first band shows evidence of an underlying, weaker, second component. This is to be expected if two rotameric forms ( syn- and ( anti-vinyl alcohol) are present. On this basis the first adiabatic ionisation energies are assigned as9.30eV ( syn) and 9.17eV ( anti). The band assignments are discussed with the aid of ab initio SCF calculations which indicate that the first band is due to excitation of an electron from the π molecular orbital which is essentially antibonding between the oxygen atom and the vinyl group.
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