Abstract
Abstract The spectrum of low-lying Rydberg transitions of the ammonium radical, NH 4 , has been calculated using the SCF LSD SW method and Slater's transition state technique. An energy-level scheme was derived which has features similar to alkali atomic spectra. All transitions between 1.6 and 3.0 eV are found to involve the 3p 2 T 2 state, with the exception of the 3d 2 T 2 −3s 2 A 1 transition. The ionization potential is estimated to lie between 4.7 and 5.1 eV. The available experimental information is critically discussed in the light of our results.
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