The Fourth International Conference on Laser Spectroscopy (FICOLS) was held in the Hotel Oberfahrt in Rottach-Egern, Tegernsee, June 11-15, 1979. Rottach-Egern is a well-known health resort situated on the southern end of Lake Tegernsee. As with the previous laser spectroscopy conferences in Vail, Megeve, and Jackson, the purpose of FICOLS was to provide n informal setting where an international group of scientists active in laser spectroscopy could discuss current problems and developments in the field. The program consisted essen- tially of invited lectures with appropriate time provided...