Abstract: The present paper covers the photoionization sections o f the different processes and different partial waves of the excited state(1s ²2p)²P of Li calculated by means of R-matrix method in the single channe l approximation and the three-state close coupling approximation, and the regul arity of the photoionization sections of the partial waves with the effective qu antum number. The results show that in the three-state close coupling approxima tion, there exists a wealth of Rydberg series of resonance structures in the pro cedure of pho-toionization due to the interaction between the autoionization st ate and the continuation states.

Key words: photoionzation, R-matrix method, three-state close ap proximation, autoionization state, rydberg resonance