1. M. Rokni and J. H. Jacob, inApplied Atomic Collision Physics, Vol. 3: Gas Lasers, H. S. W. Massey, E. W. McDaniel, and B. Bederson, eds., Academic Press, New York (1982), p. 273.
2. W. L. Nighan, ibid., p. 319.
3. M. R. Flannery, ibid., p. 141.
4. D. R. Bates,Adv. At. Mol. Phys. 20, 1 (1985).
5. D. M. Manos and D. L. Flamm,Plasma Etching, Academic Press, Boston (1989).