We have observed quantum beats in the phosphorescence of tetramethylpyrazine-d12 in a durene host crystal where the two upper spin components (Tz, 7v) decay via a common radiative channel. The initiol phase coherence required to make the beats observable was created by a 89 microwave pulse resonant with the "rz-'r v transition at 857 MHz. When, after a few microseconds, the phase coherence is lost it can be restored by a second microwave pulse and the beats then appear as an echo signal : from this experiment one obtains a dephasing time T2 = 1"2/~s.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.