Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-dependent electron-hole capture kinetics in conjugated polymers   The recombination of electron-hole pairs injected in extended conjugated
systems is modeled as a multi-pathway vibron-driven relaxation in monoexcited
state-space. The computed triplet-to-singlet ratio of exciton formation times
$r = \tau_T/\tau_S$ increases from 0.9 for a model dimer to 2.5 for a 32-unit
chain, in excellent agreement with experiments. Therewith we rationalize
recombination efficiency in terms of spin-dependent interstate vibronic
coupling and spin- and conjugation-length-dependent exciton binding
energies.Our model calculations for various length polymers indicate that the
ratio of the singlet to triplet formation ratios, $r = \sigma_S/\sigma_T$, is
inversely related to the ratio of the singlet and triplet binding energies,
$\epsilon^b_S/\epsilon^b_T$.

7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg