https://doi.org/10.1140/epjd/e2002-00120-5
Formation of Cs2 molecules via Feshbach resonances stabilized by spontaneous emission: theoretical treatment with the Fourier grid method
Laboratoire Aimé Cotton, CNRS, bâtiment 505, Campus d'Orsay,
91405 Orsay Cedex, France
Corresponding author: a francoise.masnou@lac.u-psud.fr
Received:
14
February
2002
Published online:
28
June
2002
This paper proposes a general method to investigate Feshbach resonances in atomic
collisions similar to Cs(6s) + Cs(6p) in the thermal or cold regime. In order to compute the
predissociation widths of the 
bound vibrational levels of Cs2, coupled both with the
continuum and with the 
vibrational series, a Fourier
grid method is implemented, with an optical potential. A convenient way of optimizing the latter
is proposed. A large number of resonances are found and calculations of their cross-sections for
stabilization into ground state molecules show that the rate may be important. This confirms the
interpretation of Lintz and Bouchiat [Phys. Rev. Lett. 80, 2570 (1998)]
who observed dimer formation in cell experiments. Possible generalization to the cold regime relies
on the possibility to tune the position of a resonance to coincide with the maximum of the
collisional energy distribution.
PACS: 33.80.Gj – Diffuse spectra; predissociation, photodissociation / 34.10.+x – General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.) / 34.50.-s – Scattering of atoms and molecules / 03.65.Ge – Solutions of wave equations: bound states / 02.70.Jn – Collocation methods
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
