Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: XUV+IR photoionization of argon atoms: selection of sideband orders   We present a theoretical study of atomic ionization due to an XUV pulse in
the presence of an infrared laser. Within the strong field approximation and
considering the periodicity and symmetry of the transition matrix we show that
the photoelectron spectrum can be described from the contribution during only
one (or half) infrared cycle. These symmetry and periodicity properties impress
selection rules which destructively cancel certain sideband orders favoring
others. In particular, we analyze the photoionization of Argon in four
geometrical arrangements of the polarization vector and the photoelectron
momentum direction.

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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc