P-2(0) resonances of the lithium atom in the inelastic scattering region

Recently, Kiernan and co-workers observed many new Li P-2(o) resonances in the inelastic scattering region in a high-resolution synchrotron radiation experiment. They also reported the energy (64.569(10) eV) and width (0.1 eV) for the lowest resonance, (1s2p)P-3, 3s. In this work, we carried out multichannel saddle-point complex-rotation calculations for the 15 P-2(o) resonances between the Li+ 2(1)P and 2(3)S thresholds. Relativistic corrections are included. Our results for the (1s2p)P-3, 3s energy and width are 64.568 and 0.117 eV, thus confirming the identification of the experiment unambiguously. However, we found that the structure observed near 65.2 eV is also caused by a resonance at 65.152 eV with a width of 89.7 meV. Our results agree with experiment except for the [(1s2p)P-1, 3d]P-2(o) state. We found the position of this state to be below the 2(1)S threshold.