ACKNOWLEDGEMENTS The author expresses his sincere appreciation to faculty members and fellow students for their interest and assistance during the preparation of this dissertation. Special appreciation is extended to Dr. R. B. Perez, who served as chairman of the author's graduate committee, until leaving to accept another position. The author appreciates the guidance of Dr. M. J. Ohanian, who assumed the duties of chairman following Dr. Perez's departure. The author is extremely grateful to Dr. 1. E. Wilhelm for many explanations and suggestions which were essential to the entire study. The participation of Dr. W. H. Ellis is appreciated. Several helpful suggestions from Dr. R. T. Schneider are acknowledged. The author also thanks Dr. R. G. Blake and Dr. R. A. Blue for their participation. Special appreciation is extended to Mr. W. G. Wolfer for patiently explaining the notation of molecular and atomic spectroscopy. The author appreciates the invaluable assistance so generously provided by Mrs. Jennie Grossman of the University of Florida Computing Center. The financial assistance received from two Atomic Energy Commission Special Fellowships and from the National iii