Photodetachment Studies of Alkali Negative Ions K. Andersson, D. Hanstorp, G. Haeffler, J. Sandstr=F6m U. Berzinsh=A7, I. Yu. Kiyan# and D. J. Pegg* Department of Physics, G=F6teborg University and Chalmers University of Technology, SE-412 96 G=F6teborg, Sweden =A7Department of Spectroscopy, University of Latvia, LV 1586, Riga, Latvia #Russian Academy of Sciences, General Physics Institute, 117 942 Moscow, Rus= sia *Department of Physics, University of Tennessee, Knoxville, TN 37996 USA Negative alkaline ions have been studied using laser photodetachment spectroscopy. We have studied series of resonances in Li- converging on the Li(6p) and Li(7p) thresholds and in Na- converging on the Na(4d) threshold. Both measurements were compared with recent calculations. In addition, a new measurement of the selectron affinity of Potassium will be presented.