Phys. Rev. Lett. 83, 2018–2021 (1999)NQR by Coherent Raman Scattering of a Triplet Exciton in a Molecular CrystalReceived 10 March 1999; revised 14 June 1999; published in the issue dated 6 September 1999 Nuclear quadrupole resonance (NQR) of a linear triplet exciton in 1,4-dibromonaphthalene crystals has been observed as coherent Raman scattering. The Br NQR scattering originates from the hyperfine interaction between the electron spin and the Br spins. Since delocalization of the electron spin decreases the interaction, the intensity of the NQR scattering reflects the chain length of the exciton. The exciton is found to be delocalized over about ten molecules, indicating the coherence length of the exciton is limited by scattering due to 13C isomers. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.2018
DOI:
10.1103/PhysRevLett.83.2018
PACS:
71.35.Aa, 42.65.-k, 76.70.Hb
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