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The relative intensities of the B̃ ← X̃ and C̃ ← X̃ transitions in ammonia have been measured by electron impact spectroscopy. Spectra were obtained for electrons of 90- and 250-eV incident energies with scattering angles of 0° to 3°. Analysis of the relative intensities, in conjunction with the ultraviolet data previously reported by Douglas, indicates that the C̃ state is a separate excited electronic state of ammonia, identified by the term symbol A11′.
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William R. Harshbarger (1971) studied this question.
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