Temperature-dependent zero-field df odmr of triplet excitons in β-9,10-dichloroanthracene
✍ Scribed by W. Mühle; J.U. Von Schütz; H.C. Wolf
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 734 KB
- Volume
- 131
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
ODMR on the delayed fluorescence (DF ODMR) of b-9, IO-dichloroanthracene (DCA) exhibits triplet excitons, whose signals could be recorded between 1.2 and 45 K. The exciton line broadening of 4 MHz has inhomogeneous character below 1.8 K, where propagation is coherent. At higher temperature the lines are Lorentzian due to motional narrowing. They reach the extremely narrow width of 360 kHz at 5 K. Line broadening at 75 5 K is caused by interstack scattering with the second sublattice, whose signals are recorded above 9 K additionally. From the temperature dependence of the exciton resonance frequencies and of the ODMR Iinewidth we obtain the triplet bandwidth, the intraband scattering rate P,_l. = 5 x 10' s-' at I .2 K and the interband scattering rate Pz, = 1.5 x 10' SK'. X-trap signals have been observed, including a pair state which is related to the singlet state excimer.