Abstract
The lowest triplet state of the type II relaxed exciton associated with a guest iodine monomer in KBr:I has been investigated at 3.7 K by a time-resolved optically detected magnetic resonance (ODMR) technique using a combination of pulsed microwave and ArF laser pulses for the magnetic field H //[110]. ESR spectra show both fine structure and partially resolved hyperfine structures of a V K core (IBr) - . The zero-field splitting is determined to be D = 11.29 kG and the hyperfine constants are estimated to be A // I = 262 G and A // 79 Br = 302 G. These hyperfine constants, which are much greater than 1/2 of those of the corresponding hetero-nuclear V K center, reveal large overlap of the electron on the V K core, especially on the bromine nucleus. This suggests that the bromine anion shifts toward the iodine anion and the electron is bound to the resulting half-vacancy. Time evolution of ODMR spectra and magnetic field dependence of the triplet lifetimes are also explained through the hyperfine interactions.
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