Europhys. Lett.
Volume 69, Number 3, February 2005
Page(s) 353 - 357
Section Atomic and molecular physics
Published online 05 January 2005
Europhys. Lett., 69 (3), pp. 353-357 (2005)
DOI: 10.1209/epl/i2004-10364-5

Fine-structure transitions in the exit channel of $\chem{K+Ar}$ optical collisions

C. Figl1, J. Grosser1, O. Hoffmann1 and F. Rebentrost2

1  Institut für Atom- und Molekülphysik, Universität Hannover 30167 Hannover, Germany
2  Max-Planck-Institut für Quantenoptik - 85748 Garching, Germany

received 21 September 2004; accepted in final form 24 November 2004
published online 5 January 2005

We study $\chem{K+Ar}$ collisions by laser excitation of the collision pair in a differential scattering experiment. The relative population of the K( 4p) 2P fine-structure sublevels reflects the nonadiabatic coupling in the convergence region of the interaction potentials and illustrates the energy dependence of the nonadiabatic transition probability. Close coupling scattering calculations show a very good agreement with the experimental results, indicating a corresponding accuracy of the available potential data. The spin-orbit interaction in the coupling region is found to be not significantly different from the free atom value.

34.50.Rk - Laser-modified scattering and reactions.
31.50.Gh - Surface crossings, non-adiabatic couplings.
34.20.-b - Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions.

© EDP Sciences 2005