RESONANT PHOTOIONIZATION OF ATOMIC LITHIUM IN THE REGION OF THE FIRSTAND 2ND INNER-SHELL THRESHOLDS

Using a dilute atomic beam of lithium crossed with monochromatized vac uum-ultraviolet synchrotron radiation from the undulator beamline BW3 at HASYLAB, the resulting singly ionized lithium signal was measured i n the photon; energy legion corresponding to the threshold for inner-s hell excitation. The photoion spectra were measured with a photon ener gy resolution (E/Delta E) of approximately 10000, facilitating the ide ntification of a number of window-type resonances above the 1s2s S-3 t hreshold. New R-matrix calculations are also presented which show good agreement with the observed relative intensity variation of the exper imental data.