The excited triplet states of shallow X-traps in neat single crystals of 4,4-dichlorobenzophenone were studied at liquid helium temperature by luminescence spectroscopy and magnetic resonance with optical detection. The vibrational phosphorescence bands, the polarization of phosphorescence spectra, and the triplet zero-field splitting parameters of these traps have been analyzed. A specific model of the structure defect (a molecule is turned by 180° on its long axis) has been considered in organic crystals of benzophenone type which consist of molecules whose dipole moments compensate each other in a unit cell. The calculated depth of such a dipole X-trap for triplet excitons in 4,4-dichlorobenzophenone crystals at the account of a defect molecule relaxation upon its slewing was found to be comparable with the experimental one.
The depths of exciton and electron traps arising due to the presence of structural defects in organic crystals consisting of dipolar molecules are calculated. In the model studied a structural defect appears if a molecule is rotated by 180" around the long axis as compared to the bulk molecules.
The depths of exciton and electron traps arising due to the presence of structural defects in organic crystals consisting of dipolar molecules are calculated. In the model studied a structural defect appears if a molecule is rotated by 180" around the long axis as compared to the bulk molecules. The contribution of the electrostatic interaction to the depth of the trap state on such a defect is studied in detail. For crystals consisting of molecules which have a large dipole moment in the ground state and adopting large values in the excited state this contribution may be dominant. The calculations are carried out for triplet excitons and electrons in benzophenone crystal. PaCCYHTaHbI r~y68HbI 3KCHTOHHbIX 8 3XKTPOHHbIX JlOByUIeK, BbI3BaHHbIX HaJtAYHeM CTPYKTYPHbIX Ae@eKTOB, B OprdHHYeCKUX KpUCTannaX COCTOXWMX 8 3 ~HllOJIbHbIX MOJIeKyn. B U3y9aeMO6 MOfleJIH CTPYKTYPHbIfi Aect)eKT B 0 3 H H K X T BCJIeACTBHH IlOBOpOTa MOJIeKyJIbl Ha 180" BOKPYr ,QJIkiHHO% OCH nO CpaBHeHllIo C OCTaJIbHblMll MOJIeKyJIaMU KpMCTanna. BeTaJtbHO A3yYaeTCX BKJIaA 3JIeKTpOCTaTHYe-CKOrO B3aUMOAefiCTBMII B my6ki~y JIOByIllKH. AJIX KpHCTaJUlOB COCTOXIL(UX H3 MOneKyJI C 6 0 n b r u a~ AHIIOnbHblM MOMeHTOM I4 er0 H3MeHeHWeM npH B036Y)KAeHHR 3TOT BKJIaA MOXCT 6bITb AOMHHHPY-IOWRM. KOHKpeTHble paCYeTb1 BbInOnHeHbl AJIfl TpAnJIeTHblX 3KCUTOHOB A 3JIeKTpOHOB B 6eH304eHOHe.
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