Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron-atom scattering in a circularly polarized laser field   We consider electron-atom scattering in a circularly polarized laser field at
sufficiently high electron energies, permitting to describe the scattering
process by the first order Born approximation. Assuming the radiation field has
sufficiently moderate intensities, the laser-dressing of the hydrogen target
atom in its ground state will be treated in second order perturbation theory.
Within this approximation scheme, it is shown that the nonlinear differential
cross sections of free-free transitions do neither depend on the {\it dynamical
phase} $\phi$ of the radiative process nor on the {\it helicity} of the
circularly polarized laser light. Relations to the corresponding results for
linear laser polarization are established.

8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin