Inner-shell photoabsorption of Fe14+: Unimportance of correlation and relativistic effects - art. no. 010702

We have performed a series of calculations of the photoabsorption cross sec tion of Fe14+ near the 2p(-1) and 2s(-1) edges, within the framework of R-m atrix theory. We find the unexpected result that the inclusion in the calcu lation of such effects as the spin-orbit interaction and higher-order corre lations leads to a mere redistribution of flux among the various final chan nels, while the total convoluted photoabsorption cross section remains virt ually unchanged. Hence, an appropriate minimal configuration LS coupling re presentation can adequately describe inner-shell total photoabsorption cros s sections, leading to a saving in computational effort by orders of magnit ude compared to more elaborate calculations.