Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoelectron spectra after multiphoton ionization of Li atoms in the
  one-photon Rabi-flopping regime   We calculate two-dimensional photoelectron momentum distributions and energy
spectra after multiphoton ionization of Li atoms subject to intense laser
fields in one-photon Rabi-flopping regime. The time-dependent Schr\"{o}dinger
equation is solved within the single-active-electron approximation using a
model potential which reproduces accurately the binding energies and dipole
matrix elements of the Li atom. Interaction with the external electromagnetic
field is treated within the dipole approximation. We show that the Rabi
oscillations of the population between the ground $2s$ state and the excited
$2p$ state in the one-photon resonance regime are reflected in the energy
spectra of emitted photoelectrons which manifest interference structures with
minima. Transformations of the interference structures in the photoelectron
energy spectra caused by the variation of the laser peak intensity and pulse
duration are analyzed.

12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
2
The categories of this paper are: math