Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chaotic enhancement in microwave ionization of Rydberg atoms   The microwave ionization of internally chaotic Rydberg atoms is studied
analytically and numerically. The internal chaos is induced by magnetic or
static electric fields. This leads to a chaotic enhancement of microwave
excitation. The dynamical localization theory gives a detailed description of
the excitation process even in a regime where up to few thousands photons are
required to ionize one atom. Possible laboratory experiments are also
discussed.

36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con