Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Manifestation of T-Exciton Migration in the Kinetics of Singlet Fission
  in Organic Semiconductors   Kinetics of singlet fission in organic semiconductors, in which the excited
singlet state (S_1) spontaneously splits into a pair of triplet (T) excitons,
is known to be strongly influenced by back geminate annihilation of TT-pairs.
We show that this influence can be properly described only by taking into
account the diffusive exciton migration. The migration effect is treated in the
model of two kinetically coupled states: the intermediate state of interacting
TT-pairs and the state of migrating excitons. Within this model the singlet
fission (including magnetic field effects) is studied as applied to the
fluorescence decay kinetics (FDK) I_{S_1}(t) for S_1-state. The analysis shows
that migration strongly affects the FDK resulting, in particular, in the
universal long-time dependence I_{S_1}(t) \sim t^{-3/2}. The model accurately
describes the FDK, recently observed for a number of systems. Possible
applications of the considered model to the analysis of mechanisms of
migration, using experimentally measured FDK, are briefly discussed.

13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin