Abstract
IN a previous publication1, experimental evidence was adduced for the existence of butadiene molecules in two forms, s-cis and s-trans. This evidence came from a study of the ionization potentials of butadiene gas, both by spectroscopic and electron impact methods. The existence of the two forms has recently received strong confirmation from the thermodynamic studies of Aston, Szasz, Woolley and Brickwedde2. A conflict of opinion has, however, appeared as to which of the isomers is the lower-energy form. Rasmussen, Tunnicliff and Brattain3 concluded that the s-cis form had the lower energy ; Aston et al. followed Mulliken4 in believing that the s-trans was the lower-energy form. We wish to note here that the ionization potential data indicate that the s-trans isomer is the lower-energy form.
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