Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative Treatment of the Evolution Operator Associated with Raman
  Couplings   A novel perturbative treatment of the time evolution operator of a quantum
system is applied to the model describing a Raman-driven trapped ion in order
to obtain a suitable 'effective model'. It is shown that the associated
effective Hamiltonian describes the system dynamics up to a certain
transformation which may be interpreted as a 'dynamical dressing' of the
effective model.

23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio