scattering angle with the exception of the first. [1] A brief but up-to-date review may be found in J.H. McGuire, J.C. Straton, and T. Ishihara, in Atomic, Molecular and Optical Handbook , 2nd Ed., G.W.F. Drake, Editor (Springer, New York, 2006). More extensive reviews are in Refs. [2-4] and in several monographs on atomic collisions. [2] R. Shakeshaft and L. Spruch, Rev. Mod. Phys., 51, 369 (1979) [3] K. Dettmann, in Springer Tracts in Modern Physics , vol. 58 (Springer, Berlin, 1971). See also K. Dettmann and G. Leibfried, Z. Physik, 210, 43 (1968) [4] Robert A. Mapleton, Theory of Charge Exchange (Wiley-Interscience, NY, 1972) [5] L. H. Thomas, Proc. Roy. Soc. A 114, 561 (1927) [6] E. Rutherford, Phil. Mag. 47, 276 (1924); G.H. Henderson, Proc. Roy. Soc. A 109, 157 (1925) [7] M. Lieber (unpublished), but see Ref. [1] above [8] An alternative approach to the kinematics is given in I.S. Bitensky, Am. J. Phys. 66, 624 (1998), which is based on the work of Yu.N. Demkov and F.F. Karpeshin, J. Phys. B: At. Mol. Opt. Phys. 22, L83 (1989). The latter paper has a diagram related to the Lieber diagram used here. [9] R. M. Drisko, Thesis (Carnegie Institute of Technology, 1955) (unpublished) [10] H. Vogt, et al., Phys. Rev Lett. 57, 2256 (1986) [11] E. Horsdal-Pedersen, et al. Phys Rev. Lett. (50), 1910 (1983). [12] C.J. Cook, et al., J. Chem. Phys. (63), 1218 (1975), and references cited therein. [13] J.H.Carter and M.Lieber, Am. J. Phys. 166, 758 (2007). 35