Abstract
The cross sections for the emission of dispersed fluorescences in the ultraviolet andvisible ranges by excited hydrogen atoms and NH radicals in the photoexcitationof ammonia have been obtained as a function of incident photon energy in therange of 13–40 eV, in which five superexcited states have been found.Three of these states around 22, 30 and 33 eV are doubly excited states,which have been investigated in detail for the first time and the others aresingle-hole one-electron superexcited states around 15 and 26 eV. It isremarkable that the doubly excited states around 30 eV give as largeoscillator strengths for Balmer fluorescences as the nearby single-holeone-electron superexcited states around 26 eV that are built on the (2a1)−1ion core, which seems not to be amenable to the independent electron model.
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