1. See, for example,Advances in Laser Science 1, edited byW. C. Stwalley andM. Lapp (American Institute of Physics, New York, N.Y., 1986).
2. W. T. Luh, J. T. Bahns, M. Lyyra, K. M. Sando, P. D. Kleiber andW. C. Stwalley: to be published.
3. Ya. P. Klyavinsh andM. L. Yanson:Opt. Spectrosc.,52, 376 (1982).
4. S. Milosevic, P. Kowalczyk andG. Pichler:J. Phys. B,20, 2231 (1987).
5. M. Allegrini, A. Kopystynska andL. Moi:J. Chem. Phys.,71, 2324 (1979).