Amino radicals can be produced by reacting OH radical with ammonia in irradiated aqueous solutions. This reaction is formulated as a hydrogen abstraction reaction.
The rate constant (k) for this reaction was determined to be , while the parallel reaction of OH with  was found to be much slower. This rate was redetermined by using two-pulse radiolysis competition methods with benzoate and thiocyanate ions at pH 11.4. A value of k =  was obtained from both systems. While in acidic solution, the corresponding reaction of  with  is too slow to be observed by pulse radiolysis.