https://doi.org/10.1007/s100530050542
Ionization of barium through a coherent excitation of two bound intermediate states
1
Laboratoire Aimé Cotton, CNRS II, bâtiment 505, 91405 Orsay Cedex, France
2
Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, 45110 Ioannina,
Greece
Received:
28
September
1999
Published online: 15 May 2000
We have investigated theoretically the asymmetrical photoionization yields into the 
, 
and
continuum channels of atomic barium
observed by Wang, Chen and Elliott
[Phys. Rev. Lett. 77, 2416 (1996)] in the study of coherent control through
two-color resonant interfering paths.
The atomic parameters obtained from
a theoretical approach based on a combination of
jj-coupled eigenchannel R-matrix and Multichannel Quantum Defect Theory
are used
to analyze the photoionization spectra from the 
and 6s7p
states with polarized light beams. The studied energy
range includes the 6p7p autoionizing resonances.
The dynamics of the two-color photoionization is governed by the coherent excitation
of the 6s6p and 
intermediate states. This excitation is described as an
adiabatic process in the rotating wave approximation.
The influence of the radiative decay, spatial distribution of the intensities
of the laser beams and hyperfine interaction is discussed.
PACS: 32.80.Fb – Photoionization of atoms and ions / 32.80.Qk – Coherent control of atomic interactions with photons / 31.15.Ar – Ab initio calculations
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
