Completely fine-structure-resolved photoelectron spectra produced from sodium atoms selectively excited into the ${\mathrm{Na}}^{*}$ $2p^{6}3p{}^{2}P_{1/2}$ and ${}^{2}P_{3/2}$ states were obtained using a third generation synchrotron source in conjunction with laser pumping and high-resolution spectrometry. The spectra show dramatically different behaviors. The strong variations observed in the regions of the ${\mathrm{Na}}^{+}$ $2p^{5}3p{}^{1,3}L_J$ photolines and the ${\mathrm{Na}}^{+}$ $2p^{5}4p{}^{1,3}L_J$ shakeup satellites are explained within a generalized geometrical model, accounting for the intermediate angular momentum coupling in the ionic states.

• Received 19 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.233002