PHOTOIONIZATION OF LITHIUM BELOW THE LI-3 THRESHOLD( 1S2S S)

A saddle-point complex-rotation method is used to calculate the resona nce energy, width, and photoionization cross section (PICS) of lithium below the Li+ 1s2s S-3 threshold. Fourteen P-2(o) resonances are stud ied. These results are compared with the most precise experimental dat a in the literature. Most of the Auger widths of these resonances are extremely narrow, which makes a direct theory-experiment PICS comparis on difficult. However, if we convolute the predicted cross section wit h a Gaussian profile using the experimental resolution for full width at half maximum, the resulting profile agrees closely with the high-re solution photoion measurement. [S1050-2947(97)51311-4].