Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monte Carlo simulation of resonance effects of electron transport in a
  spatially modulated electric field in Ar, N$_2$ and their mixtures   The relaxation of the distribution function of the electrons drifting under
the influence of a homogeneous electric field in noble gases is known to take
place over an extended spatial domain at `intermediate' values of the reduced
electric field, $E/N$. We investigate the transport of electrons in Ar and
N$_2$ gases, as well as in their mixtures at such $E/N$ values ($\sim$ 10-40
Td). After discussing briefly the basic scenario of relaxation in a homogeneous
electric field, the major part of work concentrates on the properties of
transport in an electric field that is spatially modulated within a finite
region that obeys periodic boundaries. The spatial distribution of the mean
velocity, the mean energy, and the density of the electrons, the importance of
the excitation channels, as well as the electron energy distribution function
are obtained from Monte Carlo simulations for various lengths of the
computational domain, at different mean values and degrees of modulation of the
reduced electric field. At low modulations, the spatial profiles of the mean
velocity and mean energy are nearly harmonic, however their phases with respect
to the electric field perturbation exhibit a complex behaviour as a function of
the parameters. With increasing modulation, an increasing higher harmonic
content of these profiles is observed and at high modulations where an electric
field reversal occurs, we observe trapping of a significant population of the
electrons. The effect of mixing a molecular gas, N$_2$, to Ar on the transport
characteristics is also examined. Transition to local transport at high N$_2$
admixture concentrations and long spatial domains is observed.

31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom