Despite considerable attention over the years, the claimed
ionization energies of the methyl- and dimethyl-substituted amidogen radicals are surprisingly diverse. In this
paper, the available evidence is reviewed and
the controversies are highlighted. New ab initio
calculations have been performed, using the ACES2 package
and the G1 and G2 methodologies, and evaluated for the amidogen
radical, NH2. It is concluded that the
inexpensive G1 and G2 calculations, including scaling, allow a
confident prediction of the ionization energies
of CH3NH (9.8 ± 0.1 eV) and
CH3NCH3 (9.1 ± 0.1 eV).
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