1. See, for example, A. Dalgarno, Rev. Mod. Phys. 39, 858 (1967).
2. R. C. Amme and H. C. Hayden, J. Chem. Phys. 42, 2011 (1965); J. Amdur and E. A. Mason, ibid. 25, 632 (1956); J. W. Boring and R. R. Humphris, AIAA J. 8, 1658 (1970).
3. R. C. Amme and N. G. Utterback, Proceedings of the Third International Conference on the Physics of Electronic and Atomic Collisions, North-Holland Publ., Amsterdam, 1963, p. 847.
4. M. L. Goldberger and K. M. Watson, Collision Theory, Wiley, New York, 1964.
5. B. H. Bransden, Atomic Collision Theory, Benjamin, New York, 1970.