Relaxation Process of Excitons in KI

摘要: It has been observed that the intensity of π emission at 3.31 eV in KI increases sharply within an exciting pulse duration and temporarily further with a time constant (τ H ) ∼1 µs, then decreases conventional decay S about 1.8 µs after excitation by pulsed N 2 laser above ∼70 K. The height absorption band 1.2 due to transition from 3 ∑ u + state higher excited relaxed excitons behaves also same way. Such temporal suggest increase population self trapped state. From temperature dependence τ , emission, excitons, which re-relax into state, is discussed.