The molar-absorptivity curves of various aliphatic ketones, mainly methyl alkyl ketones, in the gaseous state in the region from 1650 to 2000 Å have been obtained. In these ketones the absorption bands near 1950 Å and 1700 Å are denoted as A and B bands respectively. Di-n-propyl and diisopropyl ketones show, besides the A and B bands, an absorption band near 1650 Å (C band). The relations between the obtained spectra and the molecular structures of these ketones have been studied. On the basis of this study, the characteristics of the electronic transitions of A, B, and C bands have been discussed.
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Ito et al. (1969) studied this question.
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