Stability of H, D, N14, and N15 atoms in solid ammonia above 100 K

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Abstract
The measurements reported below quantify the stability and decay of hydrogen, deuterium, and nitrogen atoms in frozen ammonia above 100 K. The decay of H atoms is observed on a time scale of minutes in the range of 100–110 K and follows first-order kinetics. Analogous decays of D and N atoms are observed in the ranges 105–120 and 140–160 K, respectively. Activation energies for the decay processes range from 0.1 to 0.4 eV.