An investigation is made of the line shape of the low field resonances observed in the dependence of the fluorescence of a single A-TCNB CT crystal on the external magnetic field. It is shown that the resonance is caused by avoided crossing of magnetic sublevels of it single T-exciton arising when the direction of the field is close to the axis of the fine interaction tensor. An analytic expression for the resonance line shape is obtained. The spin-lattice relaxation rate of T-excitons, tions, (ol = (5 + 2) x 107 5-1, are determined. 3~c n e p a~e a~a n b~o HccneHoBaHa #opMa JIHHMH H H~K O I I O J I~B O~O p e 3 o~a~c a B BBBHCH-t-l --(1.0 0.3) x lo7 s-l as well as the rate of jumps between the planes of fast exciton migra-MOCTM @IIoOpeCUeHUHll MOHOKpHCTaJIJIa H n 3 A-TU6 OT IIOCTORHHOI'O BHeIUHerO MarH&iTHOI' O IIOJIR. Pe3J' JIbTaTbI HHTepIIpeTHpOBaHhI B IIpeJUIOJIO?KeHHH, YTO @JIIoOpeC-KBa3HIIePeCeYeHHeM MarHHTHbIX IIOAYpOBHefi T-3IECHTOHOB IIpH HaIIpaBJleHMH I I 0 3 R 6JIH3KOM Ic OCH TeH3Opa TOHKOrO B3aHMOAefiCTBIU€. B PaMKaX pawee IIpe&JlOWeHHOfi UeiIuHH 06yCJIOBJIeHa TT-aHHmrHnRuet. n o~a 3 a~0 , YTO 3TOT pe30HaHc 06yCJIOBJIeH MoAenH TT-aHHHrmnHqm nonyseHa aHanklTmecHaR #opMyna ~IJIR (POPM~I JIHHHH p e a o~a~c a . OnpeaeneHa crcopomb CPP T-3ISCHTOHOB: t -l = (1.0 & 0,3) x lo7 s-l H CKOpOCT b IIpbImHOB Meway IIJIOCKOCTRMH 6bIcTpofi MHrpaUHH 3KCHTOHOB O1 = (5 f 2) X x 107 8-1.
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