Abstract
Theoretically determined vertical excitation energies of C 5 and C 7 molecules have been shown to agree with the strongest diffuse interstellar band at 4430A. Several other weak diffuse bands can be identified with vibrational transitions, if 4430A band is taken as 0-3 transition and vibrational constant have a value of 2190cm -1. The vertical excitation energy of a second electronic transition of C 7 molecule agrees with diffuse band at 6177A. This electronic band system may account for diffuse bands at 5778A, 6660A and other bands near them.
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