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Abstract=A08-m1d

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[To the module Positioning (link type: TO CONTENTS; target: A08-m2] Relative differential cross sections [To a detailed and focused account of the experimental treated results (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m4bi1)] have been measured [To the module Experimental methods (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target: A08-m3a] for the atom-atom collision process $\Na+\I\to\Na^++\I^-$ at kinetic energies from 13 to 85 eV. The measurements show two types of oscillating features. The Stueckelberg oscillations are due to the interference of scattering from different potentials inside the pseudo-crossing of the covalent and ionic potential curves. Interference due to scattering from the ionic interatomic potential causes a rainbow structure that has been resolved completely [To a detailed and focused account of the experimental results on the rainbow stucture (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m4bi2)]. The measurements allow estimations of the covalent potential parameters and the pseudocrossing parameter H12 [The parameters are estimated in a Quantitative interpretation module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m5bi)]. Semiclassical differential cross sections have been calculated [The calculation is given in a Quantitative interpretation module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m5bii1)] using the lowest-order stationary-phase approximation, JWKB phase shifts [Details about these approximations are given in a Theoretical methods module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m3cii)] and the Landau-Zener transition probability [This transition probability is given in a Theoretical methods module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m3ci1)]. When the known ionic potential and the determined covalent one are substituted, there is a very good agreement between the calculated and measured differential cross sections due to collisions with small and intermediate impact parameters [The qualitative discussion of the results takes place in the Qualitative interpretation module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m5a)]. For large impact parameters a rather serious disagreement arises between the relative intensities as well as the oscillation wavelengths of the corresponding cross section [This disagreement is discussed in a Quantitative interpretation module (link type: IS EXPLAINED IN/to cause/to content; target A08-m5bii1)]. The intensity discrepancy has been removed taking into account the phenomenon of rotational coupling [Rotational coupling is given in a Theoretical methods module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m3ci2)][The impact of rotational coupling is discussed in a Quantitative interpretation module (link type: TO CONTENTS/is detailed in/is focused on in/is clarified in; target A08-m5bii2)]. [This conclusion is presented in the module Findings [link type: TO CONTENTS; target A08-m66)].