Abstract
General and analytical expressions for probabilities for center-of-mass scattering into small angles (0 deg. {<=}{theta} < or approx. 3 deg.) in elastic neutral-neutral collisions with low impact energy (0.05 eV < or approx. E < or approx. 0.5 eV) are derived. Several theories of the differential scattering into the small angles are analyzed in order to establish the most reliable differential cross section for the collisions. The 'best' cross section is then used to derive the corresponding (analytical) scattering probabilities. The approach is used to calculate the absolute values of the small-angle, low-energy differential cross sections and the scattering probabilities for the Li-Hg, Na-Hg, and K-Hg interactions.
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