Photoionization of lithium 1s(2)2s and 1s(2)2p near the triply excited resonances - art. no. 062716

A newly developed saddle-point multichannel K-matrix method is used to stud y the photoionization of lithium from 1s(2)2s and 1s(2)2p for photon energi es near the 2p2p2p P-2(o) and 2s2p2p L-2(e) (L = 0,1,2) resonances. Highly accurate initial- and target-state wave functions are used and up to 17 ope n channels are included in the calculation. The calculated partial and tota l photoionization cross sections are compared with the available theoretica l and experimental data. The partial cross sections obtained in this work s uggests that for Li 1s(2)2p and 1s(2)2p initial states, the Is electron wit h spin antiparallel to that of the 2s (or 2p) electron is the one most like ly to be ejected in the photoionization process. The elastic and inelastic electron-ion scattering cross sections are also calculated. The relative ma gnitude of the calculated collision strength is compared with the Auger bra nching ratios for these resonances.