^<55>Mn NMR Study in Magnetically Ordered State of RMn_2 (R=Rate Earth) Intermetallic Compounds

概要

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Time-dependence of the excitonic molecule luminescence in CuBr is measured at4.2 K under the one-photon band-to-band excitation and the two-photon resonantexcitation of excitonic molecules by using a picosecond tunable laser. The lifetimes ofexcitonic molecules and single excitons are determined to be 60 ps and 150 ps,respectively, by analyzing the results for the two cases of excitation. With these valuesof the lifetimes, the time-dependence of the luminescence under two types of excitationis explained self-consistently. The lifetime of molecules almost agrees with the radiativelifetime calculated by using existing theories. It is found that the probability of theformation of excitonic molecules per one collison of two single excitons is quite low,and that in the case of the resonant excitation the re-formation process of molecules isnegligible.
社団法人日本物理学会の論文
1981-04-15