Charge exchange differential cross section

From the Mulliken population, we calculate the charge exchange differential cross section. For a more complex system, in Fig. 6, the preliminary results for the direct and charge transfer differential cross section are shown for protons colliding with water at 5.0 keV as obtained by the Mulliken population analysis combined with the Schiff approximation [equation (23)]. Also for comparison we present the experimental results from Lindsay et al. [29]. 

Fig. 6. Preliminary results for the direct and charge exchange differential cross section for — H2O for at 5.0 keV. The experimental data for the differential...

It is also possible to produce He(23S) atoms by the charge exchange of He+ ions in cesium-vapor.93 This technique has been used extensively by the Stanford Research Institute (SRI) group to measure differential cross sections at higher energies (5 to 10 eV). Some of the data94 in reduced units... 

Figure 19. Reduced-variable plot of He (23S) + He differential cross sections, obtained with charge-exchange He source.

The data show that the differential cross section is dominated by the direct scattering amplitude / the modulus for the spin-flip amplitude g is in general an order of magnitude smaller. Thus the spin—orbit interaction has only a small influence on the cross section, which is mainly influenced by the Coulomb interaction, exchange, and charge-cloud polarisation. 

Not many results have been reported so far on atom-atom charge exchange collisions in the eV range (see Tables IV and VI), but those which have been obtained are extremely interesting. Total cross sections have been measured for Cs on O and Na, Li on I, whereas differential cross sections only have been reported for Na + I. 

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