Abstract
Absorption spectra of matrix-isolated NH 2 and its deuterides were measured in the range 370- 880 nm. Comparison with calculated term values, transition moments, spin-orbit splittings, and with gas-phase data rendered possible the nearly complete assignment of the spectra. At 5 K the à 2 A 1, X̃ 2 B 1 ( v 1, v 2, 0) ← X̃ 2 B 1 (0, 0, 0) system consists of Π-bands, and of very weak Σ* ← Σ and Δ* ← Σ bands which are induced by a local translational mode of ca. 70 cm −1. At elevated temperatures regular Σ and Δ bands have also been identified. This fact as well as the temperature dependence of the band shapes confirms that the radicals undergo (nearly) free rotation in therare gas cage. Term values and intensity distributions are well reproduced by the calculations, ifallowance is made for intensity borrowing by assigned and some unassigned Fermi resonances.
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