Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extreme UV generation from molecules in intense Ti:Sapphire light   We simulate the dynamics of H2+ and HD+ by direct solution of the
time-dependent Schroedinger equation for the electronic and nuclear motion for
the interaction of intense femtosecond pulses. On these timescales the
rotational motion, even for such light molecules, is frozen. Therefore it is a
reasonable assumption that the nuclear alignment is fixed during the pulse
interaction and that rotation can be neglected. In terms of vibrational
relaxation, and since the nuclei are light, vibration will be important over
femtosecond timescales. Although homonuclear diatomics are IR-inactive, in an
intense field one can create vibrational excitation through continuum coupling.
To show the effect of vibration, consider a first approximation in which the
nuclei are infinitely massive so they maintain their positions at a fixed bond
length of R=2 a.u., throughout the process.

27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs