Atomic transition probabilities: Past and future measurements

The study of atomic and ionic lifetimes and transition probabilities has undergone a period of intense activity, facilitated largely by the application of the technique of Beam-Foil Spectroscopy. This area is now a mature field of study ( having been pursued for 40 years), and has provided much new data, elucidated fundamental atomic processes, and furthered applications in many fields. However, technical advances have now broadened the field to permit new types of measurements of unprecedented accuracy and scope. Thus, this occasion offers an appropriate opportunity to review some of the successful applications of the method, to survey the present state of knowledge, and to indicate areas that hold promise for future research.