PHOTOEXCITATION OF HOLLOW LITHIUM WITH COMPLETELY EMPTY K-SHELL AND L-SHELL

A weak lithium photoexcitation resonance with completely empty K and L shells (KL-hollow lithium) has been discovered using synchrotron radi ation and photoion spectroscopy. This Li (3, 3, 3) resonance was obser ved in the doubly charged Li++ photoion yield spectrum at 175.25 eV an d demonstrates electron correlation involving all three electrons in t he excitation process. Resonance parameters obtained from the data sho w excellent agreement with the multiconfiguration Dirac-Fock calculati on which assigns 3s(2)3p as the dominant configuration.