Recoil spectrometer for the detection of single atoms

Kinetic decay of paramagnetic species formed in the radiolysis of tetracycline hydrochloride in powder form, at 77 K, shows that most of the H· is not able to migrate. Geminate recombination between H· and its partner is the main reaction: H·+TC· TCH, although a few H· succeed in diffusing slowly. But when H· acquires enough kinetic energy to migrate, it reacts preferentially with species different from its partner. The e^– is not observed by ESR, at 77 K, although tetracycline hydrochloride is a chemical trap for e^– in methanol, benzyl alcohol and alkaline aqueous solutions. In the radiolysis of tetracycline hydrochloride in powder form, the dimethylammonium group blocks H· abstraction reaction at 77 K.From a thesis submitted by S. M. L. G. to the University of São Paulo in partial fulfillment of the requirements for a Doctor of Science in Nuclear Technology.