Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical Theory of High Field Atomic Ionization Using Elliptical
  Polarization   Important information about strong-field atomic or molecular ionization can
be missed when using linearly polarized laser fields. The field strength at
which an electron was ionized, or the time during a pulse of the ionization
event are examples of such missing information. In treating single, double, and
triple ionization events we show that information of this kind is made readily
available by use of elliptical polarization.

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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex