[Spectroscopic diagnostics of electron-atom collisions: Progress report]

This research program was started in 1984, with an initial focus on developing a powerful new method for obtaining highly detailed information on resonance-line excitation, using Na as a first test case. Although part of the apparatus needed for the required two dye lasers was in place, we otherwise started with an ''empty laboratory.'' This experiment was completed at the end of 1988, although continuing analysis and preparing publications continued to the end of 1989. Our original proposal, as well as the 1987 renewal proposal, described our intention to then adapt this apparatus to three types of electron-atom excitation experiments. These are: multiply differential cross sections for other resonance-lines such as Li, metastable state excitation cross sections, such as Ca 43P and 33D, resonances in the excitation of weakly-bound states. It is still our intention to study these three areas, so this proposal is largely a reiteration of our 1987 proposal. However, I will emphasize here why these are important and the rationale behind the order in which we propose to attack these three subjects. As will be described, the proposed order has evolved due to laser developments within the last several years