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=
*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.