Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion-reaction approach to electronic relaxation in solution: Exact
  time domain solution for Dirac delta function sink model   We propose an analytical method for finding the time domain solution for the
problem of electronic relaxation of a molecule in solution. The relaxation
process is modeled by the decay of a diffusing probability distribution through
an absorbing sink. In our model, the diffusive motion is modeled using the
Smoluchowski equation for harmonic potential and the sink is represented by a
Dirac Delta function of arbitrary strength and position. This has been an
unsolved problem for a long time and is of immense importance as a model for
understanding non-radiative electronic relaxation of a molecule in solution.
Our solution can be used to understand various reaction-diffusion problems.

5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int