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Optics and Spectroscopy

Effect of resonance microwave radiation on phosphorescence of triplet excitons under bistability conditions

I. Yu. Goliney, V. I. Sugakov

Published Sep 1, 1994• 0 citations
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We have observed quantum beats in the phosphorescence of tetramethylpyrazine-d 12 in a durene host crystal where the two upper spin components (тz, тy) decay via a common radiative channel. The initial phase coherence required to make the beats observable was created by a 1/2π microwave pulse resonant with the тz-тy 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 T 2=1·2 μs.