“…This value differs from the result of an electron-impact study, where £a(N3) = 69 ± 7 kcal mole-1.524 Assignment of band A to ctts transition gave EA(NS) as 54 kcal mole-1. 526 The spectra of azide are clearly complex and only partially ctts in character, and assignments of ctts spectra "by analogy" to the halides must henceforth be made cautiously.…”