Quantum beats in the phosphorescence of a photo-excited triplet state
- 1 July 1977
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 34 (1), 171-175
- https://doi.org/10.1080/00268977700101611
Abstract
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.Keywords
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