Abstract
Previously published and new experimental data concerning the decay of electronically excited Hg atoms in low-temperature matrices are discussed on the basis of calculated potential-energy surfaces and electronic wavefunctions of the (Hg·N 2)* system. The temperature dependence of the spectrum, quantum yield and lifetime of the UV emission from the exciplex (Hg·N 2)* state is explained by two independent temperature effects on the |0 − > ↔ |0 + > mixing and on the branching ratio between the electronic and vibrational relaxation of the vibrationally hot (Hg·N 2)*# state prepared by the optical excitation. The efficient deactivation of the vibrationally excited Hg(N 2)# centers by the electronic excitation of Hg is reported and the mechanism of this process is discussed.
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