1. Majer, J. R., and Patrick, C. R., Nature, 192, 866 (1961).
2. Margrave, J. L., J. Chem. Phys., 31, 1432 (1959). Brewer, L., Margrave, J., Porter, R., and Wieland, K., J. Phys. Chem., 65, 1913 (1961).
3. Cottrell, T. L., Bond Dissociation Energies, second ed. (Butterworths, London, 1956).
4. Field, F. H., and Franklin, J. L., Electron Impact Phenomena (Academic Press, New York, 1957).
5. Majer, J. R., J. Appl. Chem., 11, 141 (1961).