Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-sequential double ionization of molecules in a strong laser field   We consider the final stage of double ionization of $\rm O_2$ molecules by
short linearly polarized laser pulses. The saddles of the effective adiabatic
potential energy close to which simultaneous escape of electrons from a
molecule takes place are identified. The analysis of the saddles and numerical
simulations of the ionization indicate that to observe clear signatures of
simultaneous electron escape in double ionization of $\rm O_2$ molecules
stronger and much shorter laser pulses than those used in the recent experiment
[E. Eremina, {\it et al}, Phys. Rev. Lett. {\bf 92}, 173001 (2004)] should be
applied.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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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: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga