Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solvent mode participation in the non-radiative relaxation of the
  hydrated electron   Non-adiabatic molecular dynamics simulations are used to analyze the role of
different solvent degrees of freedom in the non-radiative relaxation of the
first excited state of the hydrated electron. The relaxation occurs through a
multi-mode coupling between the adiabatic electronic states. The process cannot
be described by a single mode promotion model frequently used in the ``large
molecule'' limit of gas phase theories. Solvent librations and vibrations, and
the H2O asymmetric stretch in particular, are found to be the most effective
promotors of the electronic transition. Dissipation of the released energy to
the solvent proceeds on two time scales: a fast 10-20 fs heating of the first
solvation shell, where most of the energy is accepted by the librational
degrees of freedom, and a several hundred femtosecond global reconstruction of
t he solvent as the first shell transfers its excess energy to the rest of the
molecules. The implications of our use of a semiclassical approximation as the
criterion for good promoting and accepting modes are discussed.

23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs