Quasiresonance transport of excitation energy from a metastable excited atom to an inert gas cryocrystal

It is found that atomic (2p53s)3P2 centers are formed as a result of trapping of He gas discharge products in the growing neon cryocrystal. The unstable excited states (2p53s)3P2 in neon cryocrystals were observed by the EPR technique, and the effect was interpreted as a new phenomenon manifested in the form of a quasiresonance transport of excitation energy from a metastable 23S1 atom of He trapped in the growing neon cryocrystal to the exciton band of the neon crystal with a subsequent self-trapping of this exciton in the 2p53p-state. This is followed by a decay to the state (2p53s)3P2 which is actually registered in the experiment by the EPR technique. Temperature investigations show that the rate constant λ in the process of excitation energy transfer from a 23S1 atom of He to the exciton band of a neon cryocrystal quite correctly follows the Arrhenius law λ = λ0exp(–E/kT), while the activation energy E of this process is found to be equal to 0.0010(5) eV.

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