1. The research reported in this paper was sponsored by the Air Force Cambridge Research Laboratories, Office of Aerospace Research, under Contract AF19(628)446.
2. F. Brech and L. Cross, Paper 30,Inter. Conf. Spectroscopy, University of Maryland (June 1962).
3. F. Brech, J. J. Devaney, and R. W. Tabeling, Paper 19,Eastern Analytical Symp., New York (November 1962).