Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoelectron spectra in strong-field ionization by a high frequency
  field   We analyze atomic photoelectron momentum distributions induced by bichromatic
and monochromatic laser fields within the strong field approximation (SFA),
separable Coulomb-Volkov approximation (SCVA), and ab initio treatment. We
focus on the high frequency regime -- the smallest frequency used is larger
than the ionization potential of the atom. We observe a remarkable agreement
between the ab initio and velocity gauge SFA results while the velocity gauge
SCVA fails to agree. Reasons of such a failure are discussed.

26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci