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The electron spectra of the A12←1A1 and the E←12A1 transitions of ammonia have been measured with sufficient resolution to observe considerable fine structure. The first transition, A12←1A1, contains two vibrational progressions which are assigned to the ν2 bending mode. The second transition E←12A1, consists of two overlapping electron bands due to Jahn-Teller splitting of the 2E state. The vibronic structure accompanying this transition has been partially resolved and compared to the results of model calculations.
Rabalais et al. (Sun,) studied this question.