Resonant photoionization of atomic lithium in the region of the first and second inner-shell thresholds

Using a dilute atomic beam of lithium crossed with monochromatized vacuum-ultraviolet synchrotron radiation from the undulator beamline BW3 at HASYLAB, the resulting singly ionized lithium signal was measured in the photon energy region corresponding to the threshold for inner-shell excitation. The photoion spectra were measured with a photon energy resolution of approximately 10000, facilitating the identification of a number of window-type resonances above the threshold. New R-matrix calculations are also presented which show good agreement with the observed relative intensity variation of the experimental data.