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Central problem=A08-m2b

In order to test the semiclassical calculation method and to test the suitability of the Landau-Zener theory for chemi-ionization in collision processes , the $\Na+\I\to\Na^++\I^-$ collision process is studied .

For that purpose, relative differential cross sections are measured for the atom-atom collision process $\Na+\I\to\Na^++\I^-$ at kinetic energies from 13 to 85 eV, using atomic beam techniques allowing for the experimental resolution of interferences of two types, viz. the rainbow structure and the Stueckelberg oscillations .

The measurements are then compared with semiclassical differential cross sections for the chemi-ionization calculated via the deflection curves, the Landau-Zener transition probability, the stationary-phase approximation and JWKB phase shifts, using estimations of the covalent potential parameters and the pseudocrossing parameter H₁₂ based on the measurements. Calculations are performed both with and without taking into account the phenomenon of rotational coupling.